refactor: change Academy code examples to use Crawlee router

[honzajavorek]

Fix #2181, address #2097 (comment) by @B4nan

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Note

Low Risk
Low risk documentation/exercise refactor that changes sample code structure to the newer Crawlee router API without altering the scraping behavior.

Overview
Refactors the Crawlee lesson (12_framework.md) to construct CheerioCrawler without an inline requestHandler and instead register routing via crawler.router.addDefaultHandler() plus labeled addHandler() functions (e.g. DETAIL, IMDB_SEARCH, IMDB).

Updates the associated exercise solutions (crawlee_f1_drivers.mjs, crawlee_netflix_ratings.mjs) to match the router-based pattern, removing request.label branching and splitting listing/search/detail logic into dedicated handlers while keeping the same data extraction and dataset export steps.

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[Copilot]

Pull request overview

Refactors the JavaScript Academy “Using a framework” lesson and its two associated Crawlee exercise solutions to use a router-based request handling structure instead of request.label branching inside a single inline requestHandler.

Changes:

• Update lesson code examples to register handlers via addDefaultHandler() and labeled addHandler() routes.
• Refactor crawlee_f1_drivers.mjs and crawlee_netflix_ratings.mjs exercise solutions to split logic into dedicated router handlers.
• Minor variable naming adjustment in the Netflix/IMDb exercise handler logic.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
sources/academy/webscraping/scraping_basics_javascript/exercises/crawlee_netflix_ratings.mjs	Refactors the Netflix → IMDb workflow to router handlers (default, IMDB_SEARCH, IMDB).
sources/academy/webscraping/scraping_basics_javascript/exercises/crawlee_f1_drivers.mjs	Refactors listing vs. detail handling into router default + DRIVER handler.
sources/academy/webscraping/scraping_basics_javascript/12_framework.md	Updates lesson narrative and snippets to demonstrate the router-based approach.

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[B4nan]

did you change the indents on purpose? (4 -> 2 spaces)

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[honzajavorek]

@B4nan Thanks for the review! Without the missing awaits the examples couldn't work 🤦‍♂️ I hope it's all fixed now.

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[B4nan]

Btw not sure if you're into agentic development, but it would be great to let an agent read through all the tutorials and actually try them locally, this approach worked great for me. If you don't have any claude/codex/whatever subscription, someone from Apify could run this.

[honzajavorek]

I have a subscription, but not a big one. I guess this would drain my tokens really fast. @TC-MO do you think you could do this? We could have it as a side quest to improve the docs, similar to the PRs from @mtrunkat, but I'd be cautious about reviewing the work it will generate, so we better split this into self-contained fix PRs.