feat: announcements/ changelogs

[oSumAtrIX]

About

Currently, the website does not offer any dynamic data besides the version of ReVanced Manager to download. This has an impact on user retention and general interest.

Solution

Add announcements as a form of a banner to the home page and a changelogs page that displays relevant changelogs.

Additional context

Because the API is to be consumed, mocked data should be used until necessary API changes reach branch main.