Python39 EOL: update templates for Github actions (#22)

Python39 EOL: update templates for Github actions (#22)

Add package development workflow to documentation (#17)

Add missing git creds for tests (#14)

Rename GitHub actions (#6)

Replace `myst_parser` with `myst_nb` (#4)

& Update README

Include missing packages for sphinx

Fix issues with Github pages action to publish docs (#2)