[Feature] The official key mapping configs sharing page

[AkiChase]

Describe the solution you'd like

1. A web page deployed on Github Page.
2. Users can contribute their key mapping configs by pull request to web page repo.

[adgad2]

很需要，刚才下了0.7.2，发现并没有预设的和平精英方案，有点无从下手了