I use github for embedded projects: code, schematics, PCB artwork, drawings, etc. Haven't found it limiting in any way.
What else are you looking for?
So it divided to at least three directions:
1. cases and integrated systems, like smart home - thingiverse and other creators sites.
2. boards - electronics sites, in many cases connected to hobby magazines, or hobby clubs. And designs stored in ordinary libraries in paper.
3. hdl - opencores, and few others. Only direction, from 3, near perfectly suited for git format.
Allspice may be a solution.
> AllSpice: A git platform for hardware engineers