Repo Maintenance: November 2023

[superchilled]

This PR:

• Updates/ tidies up the README
• Cleans up some tests
• Defines specific permissions in the GitHub Actions

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1ade5d1) 97.94% compared to head (d5ab478) 97.94%.

:exclamation: Current head d5ab478 differs from pull request most recent head 47f11b8. Consider uploading reports for the commit 47f11b8 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #298 +/- ## ======================================= Coverage 97.94% 97.94% ======================================= Files 108 108 Lines 1999 1999 ======================================= Hits 1958 1958 Misses 41 41 ```

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