[WIP] Initial setup for running the website in Docker

[mpetason]

Changes

• Adds documentation on how to run in Docker

/kind documentation

Fixes #

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mpetason]

Looking on feedback:

• Where should this live, is this the right directory or should we put this in Docs
• I'm editing scripts used to build the site and am including them with the docker build option - should we build an image and host it in dockerhub - do we have a knative dockerhub user?
• Interested in any feedback on building the image - I'm using a larger base and am installing the Hugo version we use to make sure that we have extended. The image is around 695MB right now.

[mpetason]

Addressed the review requests. Looking for more feedback on where this should live, right now it's website/docker. I don't know if that will cause any issues. It looks like the tests are failing right now due to another issue related to an addition recently.

[knative-prow-robot]

@mpetason: PR needs rebase.

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