TestingCatalog: Apps for Beta Testing

2/2/2021

- Decreased the number of ads shown to logged users by 3 times
- Added a new nav item to let users suggest apps to be added to the catalogue
- Removed old categories from nav (will be replaced with collections soon)
- Legacy "join" button was replaced with "discuss" that leads to a discussion group in Telegram
- Help section was updated to reflect the actual state
- Sharing fab button now shares a link to Google Play instead of an old TC website
- Added 5 more apps in beta to the catalogue