Migrate to Material Design 3

Goals

• upgrade the color system without using dynamic color
• upgrade basic components (FAB, bottom app bar, etc.)
• does not introduce breakage
• minimal changes

Colors

I used our current primary (fdroid_blue #1976d2) and secondary color (fdroid_green #8ab000) with the Material Theme Builder (with matched color), and here is what I get: https://www.figma.com/file/ABnrhL6k5yDa67nOchezuD/Material-3-Design-Kit-(Community)?type=design&node-id=49823%3A12141&mode=design&t=LNzqJd5skWrE7WCK-1

We don't have a tertiary brand color. So I just used the generated tertiary color by the Material Theme Builder (magenta #A685B1), based on the Primary Color fdroid_blue #1976d2, as recommended by the guidelines for this situation.

Preview

Light

Dark

Black

Fixes #1962 (closed), #2246 (closed), #2511 (closed), #2927 (closed), #2926 (closed)