setup(cleaned & debugging)

* **Added documentation regarding how to debug the backend and the frontend**
* Updated webpack config to ease debugging (no more mimify) and a bit better production config
* Added .env files to configure env variables in the project
* Updated backend image to support .env files
* Updated backend to use .env files
* Updated CI settings accordingly
* Added documentation about IDE setup
* Removed `.vscode` folder from repo

Fixes #106 #105 Linked to #66 for .env files
9 jobs for master in 2 minutes and 37 seconds (queued for 2 seconds)
Name Stage Failure
generate_UML_svg Svg Gen Docu
Skipping Git submodules setup
Downloading artifacts for check_back (505086)...
Downloading artifacts from coordinator... ok id=505086 responseStatus=200 OK token=sULT3vTZ
$ cd documentation && make convert_to_svg
mkdir -p generated
dot -Tsvg generated/ -o generated/architecture.svg
Error: generated/ syntax error in line 1 near 'Moderation'
make: *** [Makefile:30: convert_to_svg] Error 1
ERROR: Job failed: exit code 1