* Cleaned main django settings file
* Added an app specific settings file

Fixes #90

* Removed `model_config` from all models; updated `MyModelSerializer` to include a new `obj_info` field. Updated frontend to take the change into account. (Fixes #78)
* Removed `get_viewset_permissions` from most viewsets and added a generic getter in `MyModelViewset`.
* Added support for composable permissions classes :confetti\_ball: (Fixes #45)
* Cleaned config files: separated the files; added `defaults.yaml`
* Moved `shared` folder (content) to `backend.backend_app.config` (still accessible to frontend, but it's cleaner that way since this folder contains files concerning only the backend).
* Performance update with caching some attributes;
* Even cleaner backend dynamic imports (#46)
* Added a good chunck of documentation related to the backend (#74)
* Added checks (runned when server is started or indirectly with `make check_backend`)

Some of them were simply removed, oter were fixed.
From now on, the use of TODO is not permitted in the code.

Should fix bug regarding lack of static files

Fixes #9

Closes #44

Repo structure complete redesign
Fixes #38