Create first release of solpolpy

[jmbhughes]

We want to merge develop into main at some point to create a first stable version.

Things to do:

• make sure the setup version is good (@jmbhughes )
• make sure all Ritesh's core features are included (@s0larish )
• add deploy to PyPI on release feature (@jmbhughes )... done in Create python-publish.yaml #43
• make sure tests are sufficient (@s0larish )
• include DOI from Zenodo and CI badge passing (@jmbhughes )
• incorporate any new documentation with a sample notebook (@s0larish and @mwest007 ) deferred as a new issue
• Need to finish Make example image on solpolpy documentation website show up #25
• Need to finish Replace Jupyterbook logo in solpolpy docs with solpolpy #26

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
solpolpy/constants.py	100.00% <ø> (ø)
solpolpy/graph.py	100.00% <100.00%> (ø)
solpolpy/instruments.py	100.00% <100.00%> (+4.54%)	⬆️
solpolpy/polarizers.py	96.86% <100.00%> (+0.22%)	⬆️
solpolpy/alpha.py	35.29% <50.00%> (+4.85%)	⬆️
solpolpy/core.py	77.02% <0.00%> (+11.50%)	⬆️

📢 Thoughts on this report? Let us know!.

[jmbhughes]

Targeting for November 3rd with whatever we have at the moment