This PR performs the following changes:
- update python in Dockerfile
- updates all python libraries (including Django)
- makes md5sum calculation redundant by default
- updates Postgresql used in Docker. For new installations this is ok. For existing ones this is backwards incompatible, and restore through pg_dump+pg_restore has to be performed in order to utilize Postgres 17 (since its not compatible with previous versions and will complain)
- fixes issues with HLS, and adds test to ensure they won't happen again
- allows . and @ in usernames
* Added frontend development files/environment
* More items-categories related removals
* Improvements in pages templates (inc. static pages)
* Improvements in video player
* Added empty home page message + cta
* Updates in media, playlist and management pages
* Improvements in material icons font loading
* Replaced media & playlists links in frontend dev-env
* frontend package version update
* chnaged frontend dev url port
* static files update
* Changed default position of theme switcher
* enabled frontend docker container
