Fix Clippy lints and enable on CI

[michaelsproul]

• Fix clippy
• Run Clippy on CI
• Fix some Rustdoc complaints

Closes:

• Clippy on CI #36

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.36%. Comparing base (d6819f6) to head (8756ab5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   74.36%   74.36%           
=======================================
  Files          12       12           
  Lines         749      749           
=======================================
  Hits          557      557           
  Misses        192      192           

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