docs: add Enarx website to showcase

[HarshCasper]

Motivation

This PR adds Enarx to the Docusaurus showcase.

Enarx is the leading open source framework for running applications in TEEs (Trusted Execution Environments). It's part of the Confidential Computing Consortium from the Linux Foundation.

The primary website has been built on Docusaurus.

Have you read the Contributing Guidelines on pull requests?

Yes

[netlify]

✔️ [V2]
Built without sensitive environment variables

🔨 Explore the source changes: f062162

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/61b3a8ea0f61470008c99de3

😎 Browse the preview: https://deploy-preview-6089--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	75
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-6089--docusaurus-2.netlify.app/

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[Josh-Cena]

Thanks