docs: add DoorDash Developer to showcase

[infin8x-dd]

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

Sebastien Lorber suggested I add our site to the site showcase!

Test Plan

Test links

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

Related issues/PRs

[facebook-github-bot]

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[netlify]

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 84	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 85	🟢 100	🟢 100	🟢 100	🟢 90	Report

[Josh-Cena]

@infin8x-dd friendly reminder: did you get to sign the CLA?

[slorber]

I'm in touch on Twitter, we'll take over the PR if needed