Improved documentation

[levmckinney]

• Adds a maintainers guid for the repo
• Fixes section headers
• Uses correct environment for code symbols

[codecov[bot]]

Codecov Report

Merging #87 (19217bd) into main (1d21877) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 19217bd differs from pull request most recent head d119f6b. Consider uploading reports for the commit d119f6b to get more accurate results

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   78.55%   78.55%           
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  Files          32       32           
  Lines        1735     1735           
=======================================
  Hits         1363     1363           
  Misses        372      372