Small dark theme fixes.

[jeroen1602]

Some things don't look nice yet because of hard coded colors.

• The background color for the disabled extra actions buttons don't look right.
• The selected color is almost invisible for:
  • The main device page.
  • The nicknames page.
  • The Vive Base stations ids.
• Use light Github logo instead of dark one in section About on settings page.

[mralext20]

This is probably a similar case to the "we couldn't find any baseststions" text, wherein the color is set where the text/ button is made, and not as part of the theme

[jeroen1602]

Jep, still needs to be fixed though. But I thought I'd work on #65 first since it's easier to debug this one after.

Or do you want to handle this one?

[mralext20]

i can give it a look.

[jeroen1602]

I've completed #58 with pr #67. So it should be a lot easier to change the theme than going into your system's settings.

[mralext20]

i was already using the quick settings title for flicking between them before.