automate more of the docs updates for releases

[skriss]

Currently, a minor release can require manual edits to the following:

• compatibility-matrix.md
• versions.yaml
• trivy-scan.yaml
• netlify.toml

We should see how much of this we can automate. This would likely go into hack/prepare-release.go, which already handles changelog generation and docs generation.

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[github-actions[bot]]

The Contour project currently lacks enough contributors to adequately respond to all Issues.

This bot triages Issues according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, the Issue is closed

You can:

• Mark this Issue as fresh by commenting
• Close this Issue
• Offer to help out with triage

Please send feedback to the #contour channel in the Kubernetes Slack