chore: upgrade astro and starlight

[notrab]

This attempts to upgrade Astro, Starlight and Tailwind CSS to use the latest versions but there are some regressions with the Starlight theming.

@Y3drk if you have a moment to look through the work you've done on landing pages, I'd appreciate a second set of eyes to make sure nothing was broken there.

Closes #516

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Latest commit: 8b1ee20

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[tk-o]

Time for us to learn Tailwind V4 🚀

[tk-o]

Nice work, LGTM 👍

[Y3drk]

@notrab
The code looks legit to me.

I also had a look at our LPs and the only thing that broke is the size of the embedded youtube video on ensnode.io.

How it looks on this branch:

vs how it should be (current prod):

Pretty sure, that min-[780px]:w-[520px] h-[calc(100vw*(9/16))] sm:h-[calc((100vw-222px)*(9/16))] min-[780px]:h-[340px] are the parts that cause the issues. Honestly, I've definitely over-engineered the width/height parts, and we could fix them with some aspect ratio.
Would appreciate if you could have a look at that, but I can also investigate it if you don't have time.