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[docs][pigment-css] Add guide for Pigment CSS quickstart

5

Added to material-ui/guides for now, but let me know where it should live in the meantime - [x] I have followed (at least) the [PR section of the contributing guide](https://github.com/mui/material-ui/blob/HEAD/CONTRIBUTING.md#sending-a-pull-request).

[website] Customers/Marketing page for Case Studies

4

TODO: Only pending to fix section sizes - remove date from the published case studies? Lots of placeholders/dummy content for now as we get real stuff. But wanted to start...

[examples] Update Next.js versions to v16 in Next.js examples

1

Updated Next.js version to v16 for the Examples. Also fixed inconsistencies with titles in some of the files (i.e., TypeScript/JavaScript mismatch).