docs: add pincman site to showcase

[pincman]

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

Add my site to showcase

Test Plan

Test links

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

Related issues/PRs

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 73	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 86	🟢 100	🟢 100	🟢 100	🟢 90	Report

[Josh-Cena]

@pincman I have a question: what editor is it that adds a .history directory? Could you add it to .gitignore?

[pincman]

@Josh-Cena I think I forgot to add this, I will resubmit

[pincman]

@Josh-Cena I have deleted .history in the repository

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[slorber]

LGTM thanks 👍

[slorber]

Should we merge the .history gitignore? Still not clear to me what's the purpose of it

[Josh-Cena]

It's some IDE that adds it. Not a problem to be part of the PR.