DVP-357: Algokit CLI Overview (import, +reference, +feature pages)

[lazystar]

This PR contains the ref page, an imported overview page, and all the improted feature pages.
The latter two we might want to integrate into regular docs.

I introduced a new script (not a fan) to import the algokit-cli feature docs and transform a bunch of things (e.g. links).
The methods of slugifying (the ids of titles) are so far off between Astro and gfm-toc (used in algokit-cli), that I decided to remove the the ToC entirely. Turned out to be the better choice anyway.
There are traces in the commits of building the poetry project via the typescript script, but that should not be necessary for this step.

[lazystar]

when automatically importing, we need to run the prettier rules (prettier -c ./src/** from the project roor) over the imported files, otherwise the build fails

[lazystar]

There might be additional cleanups required, like linking to a getting-started with bit.ly guide on github from the reference page.