Fedora Prerequisites are (possibly) inaccurate

[ghost]

python3-devel is required to build the wheel for Twisted, otherwise it'll just fail. psycopg2 is also required for Postgresql. I don't believe these come with the "Development Tools" group, but I might be mistaken.

[clokep]

@compu42 Can you sign-off on your commit? Thanks!

[callahad]

Using Fedora 33 on ARM, I can confirm that libpq-devel and python3-devel are required for pip install -e '.[all,test,lint]' to succeed.

Attempting to pip install --no-binary ':all:' -e '.[all,test,lint]' reveals further dependencies on libxml2-devel and libxslt-devel.

It also trips over matrix-org/python-unpaddedbase64#4: our unpaddedbase64 library doesn't provide a source distribution.

And a few dependencies need wheel installed so that bdist_wheel is available when building.

I did not need to explicitly install tk-devel or redhat-rpm-config, which were introduced years ago in d7739c4 and 5325455 respectively.

I'll tidy those up and get this merged.

[callahad]

Upon looking more closely at install.md, we have lots of very, very outdated and ill-maintained information in there.

We should probably purge it and move most distro-specific information to the GitHub wiki or similar.

[callahad]

I've continued this, cleaned it up, and pushed an additional commit over at #9322. Thank you, @compu42 !