#2180 removing addon comments from codebase

[danielduan]

Issue:

#2180 Comments addon to my knowledge hasn't worked since we upgraded to 3.0 and the components it needs such as database are deprecated. We should deprecate this as well.

There's already a copy of it inside our storybook-eol org and I don't think there has been any changes except version number bumps and eslint so I'm just going to leave it as is.

What I did

How to test

Is this testable with jest or storyshots?

Does this need a new example in the kitchen sink apps?

Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release/3.3@b5546af). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/3.3    #2189   +/-   ##
==============================================
  Coverage               ?   21.98%           
==============================================
  Files                  ?      338           
  Lines                  ?     6700           
  Branches               ?      903           
==============================================
  Hits                   ?     1473           
  Misses                 ?     4528           
  Partials               ?      699

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