BETA v21

Heya! I added better sound effects to the database, polished the UI in general and added the first community panel.

- Added new sound effects to the UI, their volume might need to be tweaked a bit.

- Added a new community info panel with an invite to the discord server.

- Added a DoNotMirror tag, used such that some VRDancing videos aren't incorrectly mirrored.

- Added additional hover events to some UI elements such that it feels more responsive.

- Fixed incorrect overlap for some hover events.

- Added warning for kids tag.

- Updated the DB, thanks to @Silvan we now have all Just Dance 3 Player videos. With more work from @MidnightEclipse and @TheeSpankEngine we are now at 3269 entries!