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.

[knative-prow[bot]]

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

Note that only knative members with read permissions, repo collaborators and people who have commented on this issue/PR can be assigned. Additionally, issues/PRs can only have 10 assignees at the same time. For more information please see the contributor guide

In response to [this](https://github.com/knative/docs/pull/5788#issuecomment-1840935362): >/assign @AdamKorcz @davidhadas > >I forgot to check this earlier, and I somehow thought the blog nav was auto-updated. Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[knative-prow[bot]]

@AdamKorcz: changing LGTM is restricted to collaborators

In response to [this](https://github.com/knative/docs/pull/5788#pullrequestreview-1765370639): >LGTM Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/knative/docs/blob/main/OWNERS)~~ [evankanderson] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[davidhadas]

/lgtm