Adding ConfigCat to showcase

[sigewuzhere]

Motivation

Upgraded from Docusaurus v1 to v2. So updated the v2 showcase as well.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Just checked the showcase page.

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

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[netlify]

Deploy preview for docusaurus-2 ready!

Built without sensitive environment variables with commit ade9785

https://deploy-preview-3762--docusaurus-2.netlify.app

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[lex111]

@sigewuzhere thanks! I've changed URL website to docs path to better demonstrate the part of the site that uses Docusaurus.

[sigewuzhere]

@lex111 Awesome! Thanks! 😸