Refactor with Next.js

[abkfenris]

Refactor to use Next.js

Tasks

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1. Fix test suite
2. Launch to dev with SPA/React-Router based routing
3. Migrate about page to app based routing
4. Migrate modeling page to app based routing #2640
   +0
   
5. Migrate platform pages to app based routing
6. Migrate home page to app based routing
7. Progressively convert elements to enable server side rendering

[abkfenris]

Cookies for unit and datum state/preferences

• https://nextjs.org/docs/app/api-reference/functions/cookies
• Using cookies in client-components vercel/next.js#54906
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies

[abkfenris]

Suspense for creating hybrid server/client components that are progressively enhanced.

[abkfenris]

• https://web.archive.org/web/20230320011125/https://nextjs.org/docs/migrating/from-react-router
• https://nextjs.org/docs/app/building-your-application/upgrading/app-router-migration

[abkfenris]

Took care of platforms and index with #2627 but ended up disabling Cypress in the process due to some React issues #2638

[abkfenris]

Using for client only components: https://react.dev/reference/react/Suspense#providing-a-fallback-for-server-errors-and-client-only-content