Revert "Revert "Replace master branch with page content via GitHub""

This reverts commit 0cb4bf923c11f5fa6927f24fab965be1ba9cfedc.
Revert "Revert "Revert "Replace master branch with page content via GitHub"""

This reverts commit ebce13742e6d49c3214af0ca287abb814abc82b9.
Revert "Revert "Revert "Revert "Replace master branch with page content via GitHub""""

This reverts commit 6ffa9a4ca518238108461012f63939f0d371a6b3.