Cleanup MultiNetworking Docs

[tssurya]

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

Let's get https://ovn-kubernetes.io/features/multiple-networks/multi-homing/ and https://ovn-kubernetes.io/features/multiple-networks/multi-network-policies/ to follow our new template: https://github.com/ovn-org/ovn-kubernetes/blob/master/docs/features/template.md which we want for consistency purposes.

Add diagrams so that end users can understand your feature easily and start using them

Why is this needed?

Consistency, more outreach like https://kubeovn.github.io/docs/stable/en/advance/multi-nic/ and eventually to get our own docs and website better

[maiqueb]

@tssurya what are your expectations for an ETA on this ?

[RamLavi]

both docs are refactored in: #4537

[github-actions]

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