Explain SIGs better, note on where to find technical support

[guineveresaenger]

This is in partial fulfillment of umbrella issue #1413.

[k8s-ci-robot]

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[guineveresaenger]

/sig contributor-experience

[castrojo]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: castrojo, guineveresaenger

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[tpepper]

Nice changes. The commit "clarifying SIG and asking questions", or the PR summary if the commits are squashed for merge, should have text indicating deletion of the contributors/devel/welcome-to-kubernetes-new-developer-guide.md file, with its content superseded now by by the new contrib guide. Somebody accustomed to that file might be confused where it went. Covering the info in that file's "The Release Process and Code Freeze" section is still a gap in the new document.

[k8s-github-robot]

Automatic merge from submit-queue.