GitLab

* Added map tile server to docker-compose dev and prod
* Moved from leaflet to mapbox gl for vector tiles (changed npm dependencies)
* Custom map styles for light and dark mode
* Changed frontend map status saving (dropped redux / simpler static data saving)

Closes #117

* Added new BaseModel /serializer/viewsets
* Change names of abstract models/serializers/viewsets
* Folder structure changed in tha backend
* Added some backend test
* Corrected bug related to moderation on non versionned modeles
* Corrected bug related to no post permissions
* Updated doc accordingly

Fixes #91

Repo structure complete redesign
Fixes #38

NoPostIfNotStaff permission added and userdata now returns the list of viewset that the user can post to.