doc: set gcloud project once in config

[scotthart]

fixes #268

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.89%. Comparing base (700640a) to head (27894ba).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #418      +/-   ##
==========================================
- Coverage   89.40%   85.89%   -3.52%     
==========================================
  Files          97       96       -1     
  Lines        3133     2814     -319     
  Branches        0      203     +203     
==========================================
- Hits         2801     2417     -384     
+ Misses        332      282      -50     
- Partials        0      115     +115     

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[dbolduc]

superduper nit: double space