update testing doc

[JeffGreiner-eaton]

Fixes BLUI-6345.

Changes proposed in this Pull Request:

• update testing doc and remove historical CRA info plus update title

Screenshots / Screen Recording (if applicable)

To Test:

• https://blui-react-docs--pr937-feature-blui-6345-up-v3p8s74c.web.app/getting-started/test-a-project

Any specific feedback you are looking for?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.96%. Comparing base (fd0ea3d) to head (b1e1112).
Report is 6 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #937   +/-   ##
=======================================
  Coverage   80.96%   80.96%           
=======================================
  Files          47       47           
  Lines        1240     1240           
  Branches      156      156           
=======================================
  Hits         1004     1004           
  Misses        137      137           
  Partials       99       99           

Flag	Coverage Δ
unittests	80.96% <ø> (ø)

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[github-actions]

Visit the preview URL for this PR (updated for commit b1e1112):

https://blui-react-docs--pr937-feature-blui-6345-up-v3p8s74c.web.app

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