Tidy the README, use chrome_152 in examples, add examples for 2.0 features

[FlorianREGAZ]

README

• The README keeps a single example (the preset one). Below it is a list of links to every file in examples/.
• The links are absolute GitHub URLs so they also work on the PyPI project page.
• The Pyinstaller / Pyarmor section is removed.

Chrome profile

Every example that uses a Chrome profile now uses chrome_152, the newest one in ClientIdentifiers. Before, they used chrome_112 or chrome_120. The certificate pinning example used the default profile (chrome_120) and now sets chrome_152 explicitly. The comment listing example names also mentions firefox_148 and safari_ios_26_0.

New examples in examples/

• example5 - async.py: moved from the README. It used to request example.com/0 to /9, which all return 404; it now uses httpbin.org/get?page={i}.
• example6 - redirects and cookies.py
• example7 - download.py
• example8 - multiprocessing.py

Testing

• Ran examples 5 to 8 against the live sites. Each printed the output written in its comments, the downloaded PNG is valid, and the spawned processes all got 200.
• Every README link points to an existing file.
• ruff check and ruff format --check pass on examples/. Ruff also added a trailing comma in the certificate pinning example.

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