docs: add Remirror to showcase

[ronnyroeller]

Motivation

Add showcase

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

N/A

Related PRs

N/A

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[netlify]

✔️ [V2]
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🔨 Explore the source changes: c9e4e36

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/61978d13f4a6310007b40893

😎 Browse the preview: https://deploy-preview-5970--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	89
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5970--docusaurus-2.netlify.app/

[Josh-Cena]

Thanks

It's indeed a large site. You may be interested in having multiple sidebars like the ts-eslint website so that the API / extension lists don't cause the sidebar to grow indefinitely