## What does this PR do?
- This PR migrates the `/auth/logout` and `/auth/signin` pages to the app directory (which runs under the App Router).
- Using `/future/auth/logout` is available at all times and is supposed to log the user out as `/auth/logout` page does.
- However `signin` page (or fragment) was used before should behave the same using the `/future/auth/signin` route.
## Requirement/Documentation
- If there is a requirement document, please, share it here.
- If there is ab UI/UX design document, please, share it here.
## Type of change
- [x] Chore (refactoring code, technical debt, workflow improvements)
- [x] New feature (non-breaking change which adds functionality)
## How should this be tested?
- Using `/future/auth/logout` is available at all times and is supposed to log the user out as `/auth/logout` page does.
- However `signin` page (or fragment) was used before should behave the same using the `/future/auth/signin` route. It was not tested locally.
## Mandatory Tasks
- [x] Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.
