Pseudo albums

[rigon]

This was way more than adding support for pseudo-albums, it was almost a complete rewrite of the front-end:

• The application was converted to TypeScript
• React was upgraded to v18
• MUI was upgraded to v5
• The gallery component was changed to react-photo-album
• The lightbox component was changed to yet-another-react-lightbox
• create-react-app/react-scripts was replaced by vite