Website: support GH page links to canonical src

[chalin]

Contributes to open-telemetry/opentelemetry.io#542

/cc @carlosalberto @mtwo @shelbyspees

[codecov]

Codecov Report

Merging #3501 (d462472) into main (e868c82) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #3501   +/-   ##
=========================================
  Coverage     90.65%   90.65%           
  Complexity     3244     3244           
=========================================
  Files           361      361           
  Lines         10007    10007           
  Branches       1020     1020           
=========================================
  Hits           9072     9072           
  Misses          618      618           
  Partials        317      317           

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[chalin]

Thanks for the approval @jkwatson.

Is there anything else to do before this is merged?
If not, can you merge it and trigger the docs-update workflow?