Let's create an easy way to run manual rebuilds on the server. This can be for a single version or multiple.

We'll need to do it fairly regularly for the occasional security versions, which are not automatically rebuilt.

We need to make sure all the env vars are set, such asPYTHON_DOCS_ENABLE_ANALYTICS=1 (see#265).

This could be a bash script, or Makefile, or something else.