Adopt sphinx-issues, drop CHANGES.rst

We can add sphinx-issues to the docs import, then use :issue: and :pr: to link back to Bitbucket rather than having to create a link reference for every single line in docs/changes.rst.

This possibly doesn’t work for CHANGES.rst because it would be rendered by Bitbucket with whichever sphinx options they have in use. But I can’t see any reason to keep the file, so we’ve probably just been wasting our time duplicating it there and in docs. We need one or the other, and we have the docs version.

Might make my copying of the changes for the website version more of a challenge, but I’m sure I’ll get over it.

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