Reskin Biome

[philpax]

Biome currently shares its styling with the web client. We should give it a distinct identity of its own that clearly indicates that it's a local client; this design should also be better-suited to the desktop platform (e.g. it should be a rectangular window with the window min/max/exit buttons where the user would expect them to be)

[philpax]

This is blocked on a general product strategy / design for Biome. We'll come back to it.