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 (closed) #105 (closed) Linked to #66 (closed) for .env files