Revert "wintersmith rebuild"

This reverts commit 7ca825d8b616f8bf046890bfa118dd33d9df7c0e, reversing
changes made to 17109f37c629ac5520e73e6af316dafc9796e362.
replaced "PI" with "Pi" in gh-pages

(this really is Revert "Revert "wintersmith rebuild"", but I just
wanted to change the commit msg)

This reverts commit 7e875cf495ec12edd4370da68073d7cb7a306f74.