.env variable support

[LBlend]

Closes #11

• Added .env file support for backend and frontend, making you able to specify the following:

  • Port for backend
  • Allow CORS by specifying frontend url in the backend
  • Specifying api/backend url in the frontend

• Added english and norwegian documentation telling users to create a .env file and specifying variables

As mentioned in the documentation, specifying ports for docker is sub-par with the current solution. This needs to be fixed in the future.

There should also be an option to specify the frontend port using .env files.

[LBlend]

There should also be an option to specify the frontend port using .env files.

apparently, react apps automatically run at the port specified in a .env if there is one (source). I will go ahead and add that to the frontend .env file now