Standardize C4A-Script tutorial, add CLI identity-based crawling, and add sponsorship CTA

[SohamKukreti]

Summary

This PR does the following:

• Switch installs to pip install -r requirements.txt (tutorial and app docs)
• Update local run steps to python server.py and http://localhost:8000
• Set default PORT to 8000; update port-in-use commands and alt port 8001
• Replace unsupported :contains() example with accessible attribute selector
• Update example URLs in tutorial servers to 127.0.0.1:8000
• Add “Identity-based crawling” section with crwl profiles CLI workflow and code usage
• Replace legacy-docs note with sponsorship message in docs/md_v2/index.md
• Minor copy and consistency fixes across pages

Addresses #1511

List of files changed and why

• docs/examples/c4a_script/tutorial/README.md: Use pip install -r requirements.txt; update local URL to http://localhost:8000; set config example PORT = 8000; adjust port-in-use commands and alt port to 8001.

• docs/examples/c4a_script/tutorial/server.py: Update example script URL in get_examples() to http://127.0.0.1:8000/playground/ to match new port.

• docs/md_v2/advanced/identity-based-crawling.md: Add CLI-driven identity-based crawling workflow using crwl profiles with steps and usage snippet.

• docs/md_v2/apps/c4a-script/README.md: Switch install to requirements.txt; update run instructions to python server.py and http://localhost:8000; set config PORT = 8000; update port-in-use commands and alt port to 8001.

• docs/md_v2/apps/c4a-script/server.py: Change example URL to 127.0.0.1:8000 and default env PORT fallback to 8000.

• docs/md_v2/core/c4a-script.md: Replace invalid :contains() selector; add accessible-attribute button example button[aria-label="Search"][title="Search"]; update local setup to requirements.txt, server.py, and http://localhost:8000.

• docs/md_v2/index.md: Replace legacy-docs note with sponsorship CTA to encourage supporting development.

How Has This Been Tested?

Verified manually and served the docs to test them.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added/updated unit tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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✨ Finishing touches

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• Create PR with unit tests
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