Update to Docusaurus stable release, fix alert admonition styling

[Simek]

Why & How

This PR updates the Docusuaurs to the latest and stable release! 🎉

There is no changelog published yet from latest RC, but there were almost no changes between those versions.

Testing the bump locally I was not bale to spot any visual regressions.

I have also utilize this bump to address the warning admonitions style, which since bump to RC started to match again against one of our legacy CSS selectors, which lead to unexpected effect (text centered, small font), those issue have been fixes as well as double underline for links in admonitions.

Preview

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[cortinico]

I've accidentally approved this one without checking the live preview. I'm handing over the @huntie for a full-review

[Simek]

Thank you for the review and catching those issues! 🙏 Will address therm soon.

Generally our styles are messy because they came with us a long way, through alphas and betas, and parts dates even back to v1. Ideally we should rewrite them all to be honest at same point. 🙂

Those top banners are something legacy, that we additionally customized before the Swizzling was an option. We probably should just replace them with admonitions or custom components.