docs: reorganize the docs to mirror the Python client

[vdusek]

Restructures the docs so they follow the Python client's layout and content, with differences only where the languages differ.

Structure

• Concepts and guides use the Python page set and ids. usage-patterns is split into single/collection clients and nested clients, retries get their own page, and examples is split into the input, tasks, retrieve-data and webhooks guides.
• New pages: Logging (@apify/log, run log redirection), Streaming resources, and Typed models (generated TS types, zod response validation, date and URL fields).
• Python's asyncio page has no JS counterpart. Bundled environments is the last concept instead, and guide 04 handles webhooks where Python integrates pandas.
• The old /docs/next URLs change. Released versioned docs are untouched, and apify-docs doesn't link to the old slugs.

Code samples

• Samples live in docs/**/code/*.ts and load into .mdx pages through raw-loader, like in the Python repo.
• pnpm tsc-check-docs type-checks them against src/ and runs in the CI lint job. oxlint and oxfmt cover them too, and the website markdownlint now includes .mdx.
• The check turned up broken samples, which are fixed: start({ waitForFinish: 60 }) sent the option as the Actor input, the webhook route lacked its leading /, and the fetch HTTP client guide didn't type-check.

Closes #851

✍️ Drafted by Claude Code

[github-actions]

⚠️ There are broken links in the documentation.

See more at https://github.com/apify/apify-client-js/actions/runs/36117686151#summary-108015595862