fix(docs): use manifests from main branch in quick-start

[whynowy]

even-odd example in quick-start is broken due to the gRPC protocol change.

Switch to using main branch manifests for installation and quick-start examples, which should be always working.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.78%. Comparing base (f6dbe86) to head (285f4b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2197      +/-   ##
==========================================
+ Coverage   63.76%   63.78%   +0.01%     
==========================================
  Files         334      334              
  Lines       40626    40626              
==========================================
+ Hits        25907    25912       +5     
+ Misses      13665    13656       -9     
- Partials     1054     1058       +4     

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