Kickoff: Replaced dedicated leave page with a button that can be accessed anywhere

Hi this is my first merge request! 😁

I think the way the "leaving" experience is kind of awkward, since every other page is for accessing stuff except for this one so I replaced the page with a button that can be accessed anywhere. When pressed a context menu comes up. It's a bit hacky, but that's the best I could do without modifying the c++ model :) (but I can change it if needed)

Here's a video of how it currently looks leavebutton