Add sticky comment for pkgdown builds

[VisruthSK]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Add sticky comment for pkgdown builds linking to the built website

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):

Visruth Srimath Kandali

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.02%. Comparing base (55342f4) to head (8a80828).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1322   +/-   ##
=======================================
  Coverage   92.02%   92.02%           
=======================================
  Files          15       15           
  Lines        6587     6587           
=======================================
  Hits         6062     6062           
  Misses        525      525           

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[jgabry]

Looks like the pkgdown workflow failed?

[VisruthSK]

I think it was an unrelated failure so rerunning

[VisruthSK]

Yup went through now.