feat(Feedback on courses): backend and frontend WIP

* Add new models in backend : Course, CourseFeedback, Exchange, ExchangeFeedback
* Begin front end for previous departure tab

#29 in progress
9 jobs for master in 4 minutes and 38 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Check
passed #498222
docker
check_back

00:00:19

passed #498223
docker
check_front

00:01:04

 
  Test
passed #498224
docker
test_back

00:00:51

93.0%
passed #498225
docker
test_frontend

00:00:50

 
  Lint
passed #498227
docker
eslint

00:00:54

passed #498226
docker
flake8

00:00:11

 
  Svg Gen Docu
passed #498228
docker
generate_UML_svg

00:00:15

 
  Documentation
passed #498229
docker
pages

00:00:11

 
  Deploy
passed pages:deploy

00:00:00