docs(framework): update Next.js and Svelte documentation links (#8572)

* docs(svelte): fix writable stores tutorial link

Update the Svelte stores tutorial link to the correct URL in the Svelte Query overview documentation.

The previous link to writable-stores was broken or outdated.

* docs(ssr): update Next.js documentation links to latest version

Update outdated Next.js documentation links in the SSR guide to point to
the latest App Router documentation paths, ensuring users are directed to
the most current and relevant documentation.

Links updated:
- rewrites feature
- automatic static optimization
- rewrite parameters