[website] chore: Replace 'Github' with 'GitHub'

[shuuji3]

Summary

The official representation of GitHub is 'GitHub' not 'Github'. This PR just replaces 'h' with 'H'.

Test plan

[codecov-io]

Codecov Report

Merging #11279 (3cff5e5) into master (4926564) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11279   +/-   ##
=======================================
  Coverage   64.23%   64.23%           
=======================================
  Files         308      308           
  Lines       13512    13512           
  Branches     3292     3292           
=======================================
  Hits         8679     8679           
  Misses       4120     4120           
  Partials      713      713           

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[SimenB]

thanks!

[shuuji3]

Thanks for merging!

[github-actions]

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