Upgrade python-scraperlib to 3.x, including CLI support for description / long_description flags

[benoit74]

See openzim/overview#21

[dikshant182004]

I hope this message finds you well. I'm Dikshant jha and I am eager to contribute to this open-source issue. After reading the project and its documentation, I think this can be the right fit as a potential task to work on as my first contribution.

I am new to open-source contributions, and I would greatly appreciate your mentorship and guidance as I get started.
If you have some time, could we schedule a brief chat or exchange messages to discuss this further? I'm eager to learn and contribute to the project's success.

Thank you for considering my request. I look forward to your response

[benoit74]

Thank you @dikshant182004 for your proposition to help. I will contact you on Slack, it will be easier to discuss there.

[dikshant182004]

okay, Let's discuss on slack

[benoit74]

We must also update Jinja2 at the same time, and get rid of markupsafe explicit version.

[benoit74]

And check if if not isinstance(html, str): in render_template is still needed.

[benoit74]

And upgrade to Python 3.11 (or 3.12 if zimscraperlib has been updated to support it)

[benoit74]

Cannot be done before #186 is solved. Otherwise, many zimfarm recipe will fail due to invalid metadata.

[benoit74]

Cannot be done before #147 in fact (#186 is a duplicate).