Upgrade scraper (Python conventions, Python version and dependencies)

[benoit74]

Fix #92

Changes:

• Python 3.12
• Upgrade + Pin Python dependencies
• Title is now a constant from the code instead of sourced from live website, in order to match the 30 chars limit
• Description and Long Description are automatically sourced from live website and match openZIM convention
• Very significant rearrangement of code architecture to enhance typing / get rid of the Global class
• All type issues have been fixed (in basic mode)

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