Add NewTube - #128

Adds NewTube to the YouTube section (after LibreTube) and bumps the AWESOME apps counter (275 → 276), following CONTRIBUTING.md.

NewTube

• Installed and tested by me on my main smartphone and used for about 15 minutes or more. (I'm the app's developer and use it daily.)
• Has dark theme.
• It has x trackers on εxodus: no εxodus report exists, because the app isn't on Google Play or F-Droid. It has no analytics, crash-reporting or ad SDKs; see PRIVACY.md.
• It has x F-Droid Anti-Features: not published on F-Droid (APKs on GitHub releases, built by GitHub Actions with build attestations).
• I use the app on a daily basis and I love almost the entirety of it, so I placed next to it a heart. (No heart claimed on my own app.)

NewTube is an unofficial app built on SmartTube, MIT-licensed and free. It doesn't need an account: signing in is optional.