Due to some backwards-compatibility-breaking changes in #905/ eee10a1, the Themes Index needs a rebuild. But it cannot happen before we release v6.5.0v7.0.0. Moreover, branch v7.0.0 needs to be pulled into the themes repo. Thus, adding it here so nobody forgets.
PS. all that needs to be done is the removal of getnikola/nikola-themes@dd8fc5b from master.
I suggest doing the switchover in v7.0.0 instead. Saves us some trouble. We will have a /v7/ directory for it, and we won’t break as much. Changed the issue.
This is already done.