Chore: stabilise development environment manifests + documentation

This brings fixes for the manifest of the development environment and adds more convenience to the repository.

• adds .editorconfig
• uses Bake for building containers
• adds a lot more documentation about how to use the development environment
• adds more healthchecks where previously missing
• adds temporary redirect from HTTP to HTTPS to the web container
• adds mandatory web network to .net. composition
• renames the web container to a canonical name independent from its technical implementation
• renames the app container to a conanical name independent from its technical function
• changes FORCE to be a common environment variable, also available to live deployments
• changes variable naming in the Nginx template where a different type is provided
• removes depreciated settings

Make sure to update your local .env with .env.example: diff .env.example .env, cp .env.example .env.

fixes #2406