Add Security Audit to blog nav

[evankanderson]

Follow-up to #5775

Proposed Changes

• Add security audit to nav under "events", following putting the fuzzing audit under the same.
• Add security audit to "Featured Posts"

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[evankanderson]

/assign @AdamKorcz @davidhadas

I forgot to check this earlier, and I somehow thought the blog nav was auto-updated.

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@evankanderson: GitHub didn't allow me to assign the following users: AdamKorcz.

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In response to this:

/assign @AdamKorcz @davidhadas

I forgot to check this earlier, and I somehow thought the blog nav was auto-updated.

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[AdamKorcz]

LGTM

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@AdamKorcz: changing LGTM is restricted to collaborators

In response to this:

LGTM

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[davidhadas]

/lgtm