Docs

[rickecon]

• make format and make documentation has been run. (You may also want to run make test.)

This PR:

• Updates the .gitignore to ignore any un_api_token.txt files
• Adds a reference to OGZAF_references.bib
• Changes all references to OG-USA in the documentation to OG-ZAF
• Updates demographics.md documentation to include better South Africa images, although we still need to finish the last three population images

cc: @jdebacker @SeaCelo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.06%. Comparing base (e8e0fcb) to head (a1df65e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   57.06%   57.06%           
=======================================
  Files          12       12           
  Lines         361      361           
=======================================
  Hits          206      206           
  Misses        155      155           

Flag	Coverage Δ
unittests	57.06% <100.00%> (ø)

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