docs: add docusaurus-openapi-docs to resources

[sserrata]

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

Others in the Docusaurus community may find docusaururs-openapi-docs useful.

Test Plan

Test links

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

Related issues/PRs

Other changes

I added "OpenAPI" to the .cspell.json words list to address the following pre-commit error:

✖ cspell --no-must-find-files --no-progress:
CSpell: Files checked: 1, Issues found: 1 in 1 files
/Users/sserrata/projects/docusaurus/website/community/2-resources.md:52:15 - Unknown word (openapi)

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 92	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 84	🟢 100	🟢 100	🟢 100	🟢 90	Report

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[Josh-Cena]

Thanks!