docs: add Webiny docs to showcase page

[swapnilmmane]

Motivation

Webiny Docs site is built using Docusaurus, added it to the showcase page.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

NA

Related PRs

NA

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[netlify]

✔️ [V2]
Built without sensitive environment variables

🔨 Explore the source changes: 3111838

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/619798ff7c5fe300078f1242

😎 Browse the preview: https://deploy-preview-5971--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-5971--docusaurus-2.netlify.app/

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[Josh-Cena]

Thanks 👍

One thing I particularly liked is the custom admonitions. How do you like the new admonition design, available in beta.4? (You are still on beta.0, but there are much more design improvements after that).