CMS change & Vercel deployment setup

[JoeKarow]

• Removed Keystone
• Moved Next.js to base dir
• Added/configured TinaCMS
• Added 'hello-world' example blog entry
• Updated repo README
• Added prettier with InReach's standard config
• Set up Vercel automatic preview deploys

Closes #18 - No longer necessary

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
inreach-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 14, 2024 11:01pm