Conflicts:
- `app/javascript/entrypoints/common.js`:
Upstream moved everything from `app/javascript/packs` to
`app/javascript/entrypoints` while this file was a glitch-soc
addition. Moved it like the rest.
- `tsconfig.json`:
Conflict due to glitch-soc's flavor.
Updated like upstream.
Also moved and updated the following files accordingly:
- `app/javascript/flavours/vanilla/theme.yml`
- `app/javascript/flavours/glitch/theme.yml`
- everything in `app/javascript/flavours/glitch/packs`
