Move webhooks section in sidenav

[alexisintech]

Important

🔎 Previews:

• https://clerk.com/docs/pr/1730/webhooks/overview
• Redirects PR: https://github.com/clerk/clerk/pull/811

Explanation:

• Terms of engagement is going to provide very limited support in the "Advanced" section of the Docs, but "Webhooks" currently exists in the "Advanced" section, and we want to fully support webhooks. So we want to move the "Webhooks" section out of the "Advanced" section in the side nav

This PR:

• Moves entire Webhooks context out of "Advanced" section of the side nav, into the "Configuration" section

Checklist

• I have clicked on "Files changed" and performed a thorough self-review
• I have added the "deploy-preview" label and added the preview link(s) to this PR description
• All existing checks pass

[github-actions]

Hey, here’s your docs preview: https://clerk.com/docs/pr/1730

[alexisintech]

Blocked until redirects are merged