Rework update-news & banner into new pre-commit hook (index-blog)

[kenodegard]

Description

We currently rely on the npm run update-news script (written in Python) to scrape the 5 most recent blog posts.

We also have a npm run banners script to generate banners for blog posts.

In this PR we seek to combine all of this into one super tool that scrapes the recent blog posts but also checks the frontmatter for correctness (e.g., is slug and image defined).

In order to avoid complexities (impossibilities?) of trying to call Node.js from Python within the pre-commit container I opted to convert update-news into a JS script (now called index-blog).

With this change both of the scripts are still callable via npm run but they are also included as a pre-commit hook.

• If I have added a new page to learn/ or community/, I have added it to the corresponding _sidebar.json file.

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[kenodegard]

pre-commit.ci autofix

[kenodegard]

ugh pre-commit seems to timeout, need to rethink how the dependencies get installed