Upgrade template

[pacrob]

What was wrong?

Merge template updates, adding nightly CI runs and fixing docs CI

Todo:

• [x] Clean up commit history
• [x] Add or update documentation related to these changes
• [x] Add entry to the release notes

Cute Animal Picture

[kclowes]

I think I'll have to override merging since not all the commits are signed, so let me know when you're ready for me to do that!