next.js

0b35ddd8 - Docs: Move `next.config.js` API pages under a `config` folder, fix headings in TS and ESLint config pages (#72465)

Docs: Move `next.config.js` API pages under a `config` folder, fix headings in TS and ESLint config pages (#72465) This PR: - Moves `next.config.js` options under a "config" folder which includes references for other configuration such as the ESLint plugin. I figure it would be tidier than having "Next.config.js Options" and "Config" in the API reference. - Fixes the issue with the "config" folder not showing up in canary: https://linear.app/vercel/issue/DOC-3749/bug-figure-out-why-new-config-folder-isnt-showing-up-in-the-canary - Fixes the indentation issues and missing example header (caused by an invisible character). Redirects: https://github.com/vercel/front/pull/38704