Redesign(front theme) 🎨🎉 & tweaks (routing, etc.)

* Complete redesign of the frontend theme => mobile friendly++ 🎨🎉
* Redesigned how the theme can be customized
* (adapted the backend to store the theme correctly + testing)
* Added a default theme for the app
* Centralized routing in the APP for consistency
* Quick fix to prevent rerendering on layout change in the university page

(backend migration required)

Fixes #19 #20
Status Job ID Name Coverage
  Check
passed #509773
docker
check_back

00:00:18

passed #509774
docker
check_front

00:00:47

 
  Test
passed #509775
docker
test_back

00:00:49

96.0%
passed #509776
docker
test_frontend

00:00:19

 
  Lint
passed #509778
docker
eslint

00:00:23

passed #509777
docker
flake8

00:00:11

 
  Svg Gen Docu
passed #509779
docker
generate_UML_svg

00:00:13

 
  Documentation
passed #509780
docker
pages

00:00:12

 
  Deploy
passed pages:deploy

00:00:00