CI updates and add Python 3.11 remove Python 3.7 and 3.8

[kafitzgerald]

Adds Python 3.11 and removes Python 3.7 and 3.8.

Other CI updates:

• Adds nightly testing to the CI workflow
• Changes the Conda environment creation a bit to make those work again
• Adds a new Conda environment file we should be able to use more universally (still some work needed here)
• Adds a macOS M1 build to the CI workflow (there a bit of a hack in the config file right now to make this work)
• Adds Dependabot
• Adds a docs build since the PR was complaining about this anyway (the docs need some attention though)

Required checks will need to be updated still.

Closes #212

[erogluorhan]

Overall this looks great; thanks very much for taking care of this! Please see my inline comments below

[erogluorhan]

Looks great!