doc: Mark TriggerMesh as Defunct

[zacheryph]

Proposed Changes

• Marks All TriggerMesh Eventing Sources as Defunct.

Sadly Triggermesh shuttered a year ago, last fall. It is sad to see them gone, though these probably should not be marked as active anymore.

I wonder if these should simply be removed or possibly add a 3rd section for.. Historic? Defunct? not sure what to name it 🤔

Reference: triggermesh/triggermesh#1544 (comment)

[knative-prow]

Welcome @zacheryph! It looks like this is your first PR to knative/docs 🎉

[knative-prow]

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[pierDipi]

I wonder if these should simply be removed or possibly add a 3rd section for.. Historic? Defunct? not sure what to name it

Thanks @zacheryph, I would remove them.

In the meantime, we're working on replacements and we would love feedback on which one you would be using here: knative/eventing#8185

[zacheryph]

@pierDipi apologize, I missed notification for this one. Updated to remove Triggermesh. I will have to take a look at that issue.

[knative-prow-robot]

PR needs rebase.

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[zacheryph]

So much for that...