add GitHub link

Author: torte71

_config.yml

@@ -31,5 +31,5 @@ callouts:
 url: https://torte71.github.io/InsideSovolKlipperScreen
 
 aux_links:
-  #Repository: https://github.com/torte71/InsideSovolKlipperScreen
+  GitHub: https://github.com/torte71/InsideSovolKlipperScreen
   #Template Repository: https://github.com/just-the-docs/just-the-docs-template