Small fixes to website and adding contributing info

[rahulkjoshi]

• Added section to contributing doc explaining requirements to locally test docs.
• Fixed broken links
• Added diagram to API explanation
• Cross-linked example API objects to user stories

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[k8s-ci-robot]

Welcome @rahulkjoshi!

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[k8s-ci-robot]

Hi @rahulkjoshi. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tssurya]

/ok-to-test

[astoycos]

Thanks for doing this @rahulkjoshi Just a few questions!

[astoycos]

Poke @rahulkjoshi Can you update this so we can get it in? :)

[rahulkjoshi]

Thanks for the poke, I lost some momentum here 🙃

PTAL, I've rebased and addressed the comments.

[astoycos]

Thanks @rahulkjoshi

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astoycos, rahulkjoshi

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/network-policy-api/blob/master/OWNERS)~~ [astoycos] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment