Added slack invite to community page

[jobbler]

Signed-off-by: John Herr joherr@redhat.com

What this PR does / why we need it: This adds a link on the community page to get a slack channel invite.

Does this PR fix any issue? _(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged)_:

Fixes #700

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[mazzystr]

/approve /lgtm

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mazzystr

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[mazzystr]

Good enough for now while we come up with a plan to refactor the entire page :)