Electronics design is too broad for such thing. So it divided to at least three directions: 1. cases and integrated systems, like smart home - thingiverse and

Electronics design is too broad for such thing. 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.