Version 0.9.6 - PyInstaller support, small fixes, more documentation, some reworks

• Added native PyInstaller support
• Fixed article configuration isolation
• Improved extraction and duplicate detection
• Added lxml 6.x support
• Expanded documentation and test coverage

What's Changed

• Add PyInstaller hooks for bundling newspaper resources ([66f2c3a](https://github.com/AndyTheFactory/newspaper4k/commit/66f2c3a4efd16a1c4f9cb04bc5d32f1ab7f59dc0))
• Prevent duplicate articles using normalized URLs and content fingerprints ([9c38f43](https://github.com/AndyTheFactory/newspaper4k/commit/9c38f43169abada4f1c6e09a20819709d8ebffef))
• Fix article language configuration across source articles ([f862726](https://github.com/AndyTheFactory/newspaper4k/commit/f8627261d905f1ea8f1f917c55a2ef795252ed09))
• Improve extractor reliability and metadata handling ([ae06add](https://github.com/AndyTheFactory/newspaper4k/commit/ae06addb443cf88f597a138fe80f2701c2660006))
• Relax the lxml upper bound to support 6.x ([31abed9](https://github.com/AndyTheFactory/newspaper4k/commit/31abed974fae8d3e7a621abf698fceb3614263dd))

Full Changelog: [0.9.5...0.9.6](https://github.com/AndyTheFactory/newspaper4k/compare/0.9.5...0.9.6)