Update upgrading and deployment docs
Copy the 0.12.1 release notes into main branch
Document need for Nginx `proxy_set_header Host` config [trac#5612]
This avoids issues with incorrect URLs in RSS feeds.
Use newer celery `shared_task` API to support celery > 4.3
Mention Elisei for the bcrypt fix
Update documentation URLs
These documented URLs previously returned a 302 redirect to a 404 page.
build intermediate files are going into .gitignore
Document how to refer to a remote database (srht#30)
Fix remaining bcrypt issue
Remove Fedora 36 build until we support Python 3.10
SourceHut only supports back to Fedora 36, so we can't still run our Fedora 33
Remove Fedora 36 build until we have Python 3.10 support
Remove unneeded pin for zipp now we have a more recent pip
Specify a minimum pip 20.2.4
Switch from `setup.py develop` to `pip install --editable .`
It's no longer recommended to use setup.py directly. This also potentially gives
us access to recent version of Pip that have better dependency resolution.
Remove unused pyconfigure M4 macros
Turns out we weren't using these at all.