Task: Implement Directly support chat variation

[alshakero]

Details

We'll need to implement Directly support variation in the help center. I did a spike and here are the steps we'll need to do, we'll do this in twp steps (PRs):

Step I

• Move this folder into a package, should be copy-paste, typing and some cleanup. I already did that. Please build on top of my draft PR.
• Use the moved files in this Calypso file.
• Make sure everything works in Calypso.
  • By applying this patch: D80798-code.
  • Changing line 17 of this the file public.api/rest/wpcom-json-endpoints/class.wpcom-json-api-help-directly-endpoint.php to 'isAvailable' => true.
  • Changing this function to always return SUPPORT_DIRECTLY.
  • Going to http://calypso.localhost:3000/help/contact
  • Ask a question that's clearly a testing question, all should work (you should see a Directly chat modal open).

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Step II

• Use the package in the help-center itself.
• Figure out how to put the Directly iframe inside the help-center.