Docker testing and validation

[davidnoyes]

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[davidnoyes]

While making changes to the documentation, I found having to install NodeJS to run the Next server and linting validation wasn't always desired. I've created a dockerfile and makefile to perform the same tasks.

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[ThatsMrTalbot]

This does go against the conventions of the other repos, doing everything in docker by default.

But it also would make development easier, probably need some further opinions.

Other repos vendor all dependencies, though that could get heavy if we need to vendor nodejs itself

[davidnoyes]

I'd say that this change doesn't set a new default but just adds another option.

[cert-manager-prow]

PR needs rebase.

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