Cleanup DNS name resolver docs

[tssurya]

What would you like to see added/updated/deleted in our docs?

Change https://github.com/ovn-org/ovn-kubernetes/blob/master/docs/features/network-security-controls/dns-name-resolution.md to follow our docs template for https://github.com/ovn-org/ovn-kubernetes/blob/master/docs/features/template.md

Why is this needed?

Add diagrams to let users understand your topology, components how they can use this on a KIND cluster etc.
Add this doc to our website by adding navigation to this page via mkdocs.yaml file

[tssurya]

/assign @arkadeepsen

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[arkadeepsen]

Have already started working on this.