Refactor to use `dub` TypeScript SDK

[steven-tey]

This PR adds the dub TypeScript SDK and uses the new Workspace API Keys feature that we launched recently.

• [x] Create a workspace API key
• [x] Optionally create a machine user to associate the key with
• [x] Update the DUB_API_KEY env var locally + in Vercel
• [x] Redeploy the preview branch
• [x] Once everything looks good, merge the PR 🎉

[vercel[bot]]

@steven-tey is attempting to deploy a commit to the Cap Software Inc Team on Vercel.

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[richiemcilroy]

@steven-tey - thank you so much! this is perfect. Merged!

[steven-tey]

LFG 🚀