Major Restructure

[gilesknap]

• switch to github acttions for CI
• switch to github pages for docs
• siwtch to github container registry
• switch to pip instead of pipenv
• use tox for code verification
• rewrite documentation with sphinx

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@a6b0dde). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #348   +/-   ##
=======================================
  Coverage        ?   89.20%           
=======================================
  Files           ?       25           
  Lines           ?     1955           
  Branches        ?        0           
=======================================
  Hits            ?     1744           
  Misses          ?      211           
  Partials        ?        0           

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