Remove build-lambda-zip badge from README

[bmoffatt]

Removed build-lambda-zip badge from README.

Dead link, canary workflow for long deprecated install method has been disabled for awhile.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.30%. Comparing base (de51f68) to head (61f56ce).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #599   +/-   ##
=======================================
  Coverage   73.30%   73.30%           
=======================================
  Files          26       26           
  Lines        1487     1487           
=======================================
  Hits         1090     1090           
  Misses        324      324           
  Partials       73       73           

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