Split media and static folders

[Xpirix]

• This PR will prevent deleting files from media folders (cache, geopackages, models, packages, styles, wavefronts) when running python manage.py collectstatic --clear.

This is also for:

• 298

• 114

Changes summary

• Use differents volumes for media and static in docker-compose for dev environment
• Add a command to collectstatic and delete folders from media that exist in static

Requirements on the server-side

• Update the docker-compose.yml for rancher to keep the current volume for media and use a different volume for static. For example:

  volumes:
  - django-statics-data:/home/web/static:rw
  - the_current_volume:/home/web/media:rw

  It's better to update this file in the code to match the configuration on rancher (confirmation needed)

• Restart the rancher server and run python manage.py collecstatic to generate the static folders inside django-statics-data

• (Optional) After making sure that everything is okay, we can delete all static folders inside the_current_volume by running cleanmediafolder

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a9dabb5) 36.97% compared to head (a36953e) 82.75%. Report is 1 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #340 +/- ## =========================================== + Coverage 36.97% 82.75% +45.77% =========================================== Files 106 142 +36 Lines 4500 5497 +997 =========================================== + Hits 1664 4549 +2885 + Misses 2836 948 -1888 ```

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