Link to supply-chain details rather than including inline.

[evankanderson]

Followup to #6193

Proposed Changes

• Reduces the text on the YAML/operator install pages, and makes clear that signature verification is an optional step, and not a required prerequisite

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[Cali0707]

/lgtm

I like this, IMO definitely makes the install instructions clearer

/hold in case @pierDipi or @dprotaso have opinions (since this changes the install docs for Serving/Eventing)

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, evankanderson

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[Cali0707]

/cc @dprotaso @pierDipi

[dprotaso]

/hold cancel

thanks for the follow up Evan

[dprotaso]

/cherry-pick release-1.16

[knative-prow-robot]

@dprotaso: new pull request created: #6200

In response to this:

/cherry-pick release-1.16

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