[ENG-362, ENG-476, ENG-503] Next.js (#817)

* update landing packages & tailwind

* move images

* refactor to nextjs

* doc stuff

* rename markdown to mdx

* working docs

* Add math

* fix pnpm-lock

* Code highlighting

* fix types

* fix more stuff

* Notice component and removed slot

* delete editorconfig eslint rule

* pnpm-lock

* some fixes

* fixed types (pls)

* bump ui's typescript too

* commit next-env.d.ts

* fix doc links

* Use next/head instead of react-helmet & rehype-external-links

* fixes

* fix unsub from list

* add trim() to docs.excerpt

* trim doc title too

* fix titles

* replace <a> to Link

* hide .contentlayer & .next from vscode search
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