github layer to
dotspacemacs/layers in the
~/.spacemacs configuration file and reload using
SPC f e R or restart Spacemacs
SPC q r.
You can push and pull changes to any repositories your local git repository is connected to. You can also search for repositories on GitHub, then clone and even fork them.
SPC g h opens the GitHub menu
Browsing and cloning remote repositories is via the Git Github menu,
SPC g h.
And there is a specific menu for Cloning remote Github repositories.