Enable new "help" section and fix a few things

[RichieEscarez]

Add website elements to support the new "docs help" section:

• Added text for Menu links
• Replaced the content of CONTRIBUTING and DEVELOPMENT with links to this new "help" section.
• Add the option to run a "production" version of a local build

OTHER DEPENDENT PRS: This is the knative/website PR, and is 1 of 3:

• https://github.com/knative/docs/pull/3437
• https://github.com/knative/community/pull/557

https://github.com/knative/docs/issues/2960

[RichieEscarez]

This PR preview: https://deploy-preview-288--knative.netlify.app/

See the related docs changes here: https://606e6bb8100bcf24dd87be98--knative.netlify.app/help/contributor/publishing/

[RichieEscarez]

The content has been merged: https://github.com/knative/docs/pull/3437

This PR can go in now to show/expose both the Template and Docs Help links in the right nav menu:

https://deploy-preview-288--knative.netlify.app/docs

https://deploy-preview-288--knative.netlify.app/blog

[evankanderson]

/hold cancel /approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: evankanderson

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/knative/website/blob/main/OWNERS)~~ [evankanderson] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[RichieEscarez]

Another LGTM, please (the bot removed it from the last commit)

[evankanderson]

/lgtm