Replace IRC since mostly unused + Freenode fiasco

[xeraa]

Thanks to @jstrassb for finding this one.

Pull request acceptance prerequisites:

• Signed the CLA (if not already signed)
• Rebased/up-to-date with base branch
• Tests pass
• Updated CHANGELOG.md with patch notes (if necessary)
• Updated CONTRIBUTORS (if attribution is requested)

[ghoneycutt]

This is managed by VP so it should use our contact info.

[xeraa]

That's fair — I was mostly after cleaning up "dead ends".

What do you want to put down for VP? And do you think it would make sense to break it into this?

• For this module, contact X
• For general Elasticsearch questions, go to ...

[smortex]

@xeraa +1 for splitting

The info in the footer of https://voxpupuli.org/ should be fine I think.

[bastelfreak]

we did the cleanup in #1143

[xeraa]

Thank you!