Add CI / GH Pages example to Docusaurus deployment documentation

[AndrewDiMola]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

This documentation helps readers deploy a Docusaurus website to GitHub pages.

Test Plan

Tested the contents of the MDX locally.

Test links

Update to this page: https://docusaurus.io/docs/deployment

With these supporting links:

• Buildkite
• cluster
• pipeline emoji

Deploy preview: https://deploy-preview-11413--docusaurus-2.netlify.app/

Related issues/PRs

N/A

[netlify]

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[slorber]

I'm sorry, but we are not adding more hosting to that page anymore

See why here #10481 (comment)

[AndrewDiMola]

@slorber - Thank you for the prompt response and for the context. Appreciate your time!