forward args to flask from wsgi

[RedX2501]

To enable accessing the backend on the local network add the possibility of passing host to the wsgi script.

Additionally improve the documentation to show these new features and clarify how to debug.

[TomBursch]

Again, thanks for this and helping others in the future!
Initially, I didn't want to add any information about any IDE, but I think you're right, it's better to have that.

I only have some minor things:

• I would suggest opening the backend folder and the frontend/kichenowl folder in separate VSCode windows, this makes it a bit easier to work with the project.
• Remove the cwd and args from the vscode configuration
• And add this flutter vscode configuration:

{
    "name": "kitchenowl",
    "request": "launch",
    "type": "dart"
},
{
    "name": "kitchenowl (profile mode)",
    "request": "launch",
    "type": "dart",
    "flutterMode": "profile"
}

[RedX2501]

Yeah i haven't added those as they are automatically suggested by VS code.