docs: Update environment-variables.md with info about env.DEV

[spookyuser]

I'm not sure if this is a bug or intended but if it's not a bug and the docs just need to updated, hopefully this is correct. I also removed the deprecated chromeApi key.

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[aklinker1]

Some small structural changes, then we're good to merge. Thanks for opening a PR!

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commit: 699d230

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.19%. Comparing base (d32d179) to head (699d230).
Report is 182 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1630      +/-   ##
==========================================
+ Coverage   81.18%   81.19%   +0.01%     
==========================================
  Files         128      130       +2     
  Lines        6298     6642     +344     
  Branches     1070     1088      +18     
==========================================
+ Hits         5113     5393     +280     
- Misses       1170     1238      +68     
+ Partials       15       11       -4     

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