Add functionality to frontend

[A9-dev]

• Make the buttons do their authentication and get song task
• Update the stepper when a new phase has been entered
• Update the image skeleton with the generated image

[A9-dev]

This will be much easier to do after the authentication and image generation is done for the respective components.

[Viibrant]

I'm working on #7 next, after that we should be in a good position to integrate that data into the front end, and also to generate images.

[Viibrant]

Picking this uuuuup. Done some auth stuff already, gonna do a sign out button and I'll write a context manager for the phase stuff.

[Viibrant]

Ok some refreshing stuff is giving me aids. If you spin it up and look in console you'll see what I mean, gonna ignore that for now. I reckon we have a separate login page, just ironing out the auth flow now..