add partial for version banner

[moficodes]

• add partial for version banner
• add a version called latest in the version list

[moficodes]

@jmhbnz

[jmhbnz]

I am still seeing that v3.4 is showing up in the deploy preview as having the deprecation banner? https://deploy-preview-900--etcd.netlify.app/docs/v3.4/

v3.4 is still supported so should not have the banner, please let me know if I am missing something.

[moficodes]

There was is_deprecated flag set on 3.4 removed in the latest commit.

[ivanvc]

This change looks good to me. One thing worth noting is that the v3.6 docs now show a warning, too. I think it should be fine, but I just wanted to raise awareness of it.

https://deploy-preview-900--etcd.netlify.app/docs/v3.6/

[k8s-ci-robot]

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This pull-request has been approved by: ivanvc, jmhbnz, moficodes

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