Update docs to include serve_frontend env var

[evroon]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.74%. Comparing base (f760d6d) to head (4850746).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1496      +/-   ##
==========================================
- Coverage   94.77%   94.74%   -0.03%     
==========================================
  Files         120      120              
  Lines        4363     4379      +16     
==========================================
+ Hits         4135     4149      +14     
- Misses        228      230       +2     

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