docs: improve README wording

[MarianoVigliocco]

Pre-flight checklist

• I have read the [Contributing Guidelines on pull requests](https://github.com/facebook/docusaurus/blob/main/CONTRIBUTING.md#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

Improve the wording in the README introduction section by removing repetitive phrasing ("project project websites"), making the sentence read more naturally and clearly.

Test Plan

• Verified the Markdown renders correctly in the README preview on GitHub.
• Confirmed that the wording change does not affect formatting or links.

Test links

README.md

Deploy preview: https://deploy-preview-12075--docusaurus-2.netlify.app/

Related issues/PRs

N/A

[meta-cla]

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[meta-cla]

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[slorber]

I'm not 100% agreeing this is an improvement, and changes the meaning of that sentence. It's the project that is often open source, not the website, although both generally are