Modernize frontend code
Aside from the child epics (see below), the following might make sense:
- [ ] get rid of pure-grid
- [ ] drastically downsize `css/content.css`
- [ ] remove `src/Lib/View/vPage.php`
- from `BasketView`
- from `ProfileView`
- from codebase
- [ ] weed out `src/Lib/View/Utils.php`
- ultimately: remove all html/js in php strings
- use vue for all dynamic kind of templates
- this list of ideas is still growing ;-)
### See also
- image upload => &4
- translations => &7
- move Xhr to Rest => &9
- anything that belongs to registration => &14
- basically rebuilding the quiz => &16
epic