Cleanup

[peterthomassen]

As discussed, this removes support for Django < 4.2 and Python < 3.8.

Further changes:

• code cleanup
• docs updates
• dependency bumps
• remove Windows line endings

[peterthomassen]

This has gotten a little larger due to the last commit, but don't get scared, it's just whitespace changes ;-) Ready for review.

[tomchristie]

Wonderful, thanks.

but don't get scared, it's just whitespace changes

In general let's try to isolate changes as much as possible. The easier it is to review, the less likely we are to have sneaky errors creeping in. 😅