chore: Replace references to deprecated services

apps/landing/src/pages/guides/email-api-guide.tsx

@@ -10,7 +10,7 @@ export default function EmailAPIGuide() {
       description="Complete guide to email APIs: how they work, implementation examples, best practices, and choosing the right solution for your application."
       lastUpdated="2025-12-20"
       readTime="12 min"
-      canonical="https://www.useplunk.com/guides/email-api-guide"
+      canonical="https://next.useplunk.com/guides/email-api-guide"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">
@@ -132,7 +132,7 @@ export default function EmailAPIGuide() {
               language="javascript"
               title="Node.js Example"
               code={`// Using fetch (Node.js 18+ or with node-fetch)
-const response = await fetch('https://api.useplunk.com/v1/send', {
+const response = await fetch('https://next-api.useplunk.com/v1/send', {
   method: 'POST',
   headers: {
     'Content-Type': 'application/json',
@@ -167,7 +167,7 @@ if (response.ok) {
               code={`import requests
 
 response = requests.post(
-    'https://api.useplunk.com/v1/send',
+    'https://next-api.useplunk.com/v1/send',
     headers={
         'Content-Type': 'application/json',
         'Authorization': 'Bearer YOUR_API_KEY'
@@ -195,7 +195,7 @@ else:
               language="php"
               title="PHP Example"
               code={`<?php
-$ch = curl_init('https://api.useplunk.com/v1/send');
+$ch = curl_init('https://next-api.useplunk.com/v1/send');
 
 curl_setopt($ch, CURLOPT_POST, true);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
@@ -235,7 +235,7 @@ if ($httpCode === 200) {
               code={`require 'net/http'
 require 'json'
 
-uri = URI('https://api.useplunk.com/v1/send')
+uri = URI('https://next-api.useplunk.com/v1/send')
 http = Net::HTTP.new(uri.host, uri.port)
 http.use_ssl = true
 
@@ -295,7 +295,7 @@ func main() {
 
     jsonData, _ := json.Marshal(email)
 
-    req, _ := http.NewRequest("POST", "https://api.useplunk.com/v1/send", bytes.NewBuffer(jsonData))
+    req, _ := http.NewRequest("POST", "https://next-api.useplunk.com/v1/send", bytes.NewBuffer(jsonData))
     req.Header.Set("Content-Type", "application/json")
     req.Header.Set("Authorization", "Bearer YOUR_API_KEY")
 

apps/landing/src/pages/guides/email-bounce-rate.tsx

@@ -10,7 +10,7 @@ export default function EmailBounceRate() {
       description="Understand email bounce rates, the difference between hard and soft bounces, and proven strategies to reduce bounces and protect your sender reputation."
       lastUpdated="2025-12-20"
       readTime="9 min"
-      canonical="https://www.useplunk.com/guides/email-bounce-rate"
+      canonical="https://next.useplunk.com/guides/email-bounce-rate"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/email-click-through-rate.tsx

@@ -10,7 +10,7 @@ export default function EmailClickThroughRate() {
       description="Learn what affects email click-through rates, industry benchmarks, and proven tactics to optimize CTAs and boost engagement."
       lastUpdated="2025-12-20"
       readTime="10 min"
-      canonical="https://www.useplunk.com/guides/email-click-through-rate"
+      canonical="https://next.useplunk.com/guides/email-click-through-rate"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/email-deliverability.tsx

@@ -9,7 +9,7 @@ export default function EmailDeliverability() {
       description="Learn proven strategies to improve email deliverability, avoid spam filters, and maximize inbox placement rates. Complete guide with best practices."
       lastUpdated="2025-12-20"
       readTime="12 min"
-      canonical="https://www.useplunk.com/guides/email-deliverability"
+      canonical="https://next.useplunk.com/guides/email-deliverability"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">
@@ -306,9 +306,7 @@ export default function EmailDeliverability() {
       {/* Monitoring */}
       <section id="monitoring" className="mb-12">
         <h2 className="text-3xl font-bold text-neutral-900 mb-6">Monitoring Email Deliverability</h2>
-        <p className="text-neutral-700 leading-relaxed mb-6">
-          Track these metrics to stay on top of deliverability:
-        </p>
+        <p className="text-neutral-700 leading-relaxed mb-6">Track these metrics to stay on top of deliverability:</p>
 
         <div className="grid gap-6 md:grid-cols-2">
           <div className="rounded-xl border border-neutral-200 bg-white p-6">

apps/landing/src/pages/guides/email-marketing-best-practices.tsx

@@ -9,7 +9,7 @@ export default function EmailMarketingBestPractices() {
       description="Master email marketing with proven best practices for content, design, timing, deliverability, and compliance. Comprehensive guide for 2025."
       lastUpdated="2025-12-20"
       readTime="15 min"
-      canonical="https://www.useplunk.com/guides/email-marketing-best-practices"
+      canonical="https://next.useplunk.com/guides/email-marketing-best-practices"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/email-open-rate.tsx

@@ -10,7 +10,7 @@ export default function EmailOpenRate() {
       description="Learn what affects email open rates, industry benchmarks, and proven tactics to improve opens. Complete guide with actionable tips."
       lastUpdated="2025-12-20"
       readTime="10 min"
-      canonical="https://www.useplunk.com/guides/email-open-rate"
+      canonical="https://next.useplunk.com/guides/email-open-rate"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/email-sender-reputation.tsx

@@ -10,7 +10,7 @@ export default function EmailSenderReputation() {
       description="Learn how sender reputation works, what affects it, and proven strategies to build and maintain a positive reputation for maximum deliverability."
       lastUpdated="2025-12-20"
       readTime="11 min"
-      canonical="https://www.useplunk.com/guides/email-sender-reputation"
+      canonical="https://next.useplunk.com/guides/email-sender-reputation"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/index.tsx

@@ -103,13 +103,13 @@ export default function GuidesIndex() {
       <NextSeo
         title="Email Marketing & Deliverability Guides | Plunk"
         description="Learn email best practices, authentication (DKIM, SPF, DMARC), deliverability optimization, and more. Free guides from Plunk."
-        canonical="https://www.useplunk.com/guides"
+        canonical="https://next.useplunk.com/guides"
         openGraph={{
           title: 'Email Marketing & Deliverability Guides | Plunk',
           description:
             'Learn email best practices, authentication (DKIM, SPF, DMARC), deliverability optimization, and more.',
-          url: 'https://www.useplunk.com/guides',
-          images: [{url: 'https://www.useplunk.com/assets/card.png', alt: 'Plunk Guides'}],
+          url: 'https://next.useplunk.com/guides',
+          images: [{url: 'https://next.useplunk.com/assets/card.png', alt: 'Plunk Guides'}],
         }}
       />
 

apps/landing/src/pages/guides/transactional-vs-marketing-email.tsx

@@ -9,7 +9,7 @@ export default function TransactionalVsMarketingEmail() {
       description="Understand the critical differences between transactional and marketing emails, including legal requirements, deliverability, and best practices."
       lastUpdated="2025-12-20"
       readTime="10 min"
-      canonical="https://www.useplunk.com/guides/transactional-vs-marketing-email"
+      canonical="https://next.useplunk.com/guides/transactional-vs-marketing-email"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/what-is-dkim.tsx

@@ -10,7 +10,7 @@ export default function WhatIsDKIM() {
       description="Learn how DKIM (DomainKeys Identified Mail) protects your emails from spoofing and improves deliverability. Complete guide with setup examples."
       lastUpdated="2025-12-20"
       readTime="8 min"
-      canonical="https://www.useplunk.com/guides/what-is-dkim"
+      canonical="https://next.useplunk.com/guides/what-is-dkim"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/what-is-dmarc.tsx

@@ -10,7 +10,7 @@ export default function WhatIsDMARC() {
       description="Learn how DMARC works with SPF and DKIM to protect your domain from email spoofing. Complete setup guide with policy examples."
       lastUpdated="2025-12-20"
       readTime="9 min"
-      canonical="https://www.useplunk.com/guides/what-is-dmarc"
+      canonical="https://next.useplunk.com/guides/what-is-dmarc"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">

apps/landing/src/pages/guides/what-is-spf.tsx

@@ -10,7 +10,7 @@ export default function WhatIsSPF() {
       description="Learn how SPF records work, prevent email spoofing, and improve deliverability. Complete guide with setup examples and best practices."
       lastUpdated="2025-12-20"
       readTime="7 min"
-      canonical="https://www.useplunk.com/guides/what-is-spf"
+      canonical="https://next.useplunk.com/guides/what-is-spf"
     >
       {/* Introduction */}
       <section id="introduction" className="mb-12">