Chore/upgrade-nextjs-auth0

[eatplaysleep]

This is a big one -- upgrading to auth0 v4 required quite a few changes.

• Add middleware.ts per auth0 guidance
• Deprecate /api/auth/xxx routes
• implement useUser where appropriate to reduce the need to pass user as a prop
• Fix api implementation(s) per NextJS v14 guidance.
  • Will make major changes to API implementations when I do v15 upgrade
• Add .env.sample to make things easier
• Update README
• Add mock UserProvider (makes doc examples possible and easier)
• Update all necessary DOCS files to ensure code and examples generate correctly

TODO In an upcoming PR

• upgrade NextJS to v15 (will require significant refactoring)
  • enhance API handling
  • improve server/client data exchange
• implement shadcn registry support (ability to import components via npx)
• remove use-xxx hooks in favor of NextJS data streaming
• reduce number of client components

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