[WIP] Rethink of tailwind backend

[jaxwilko]

I've been meaning to re-work this for a while.

So far I've stripped out the headless ui stuff, stuck in a Backend vue component, then pass the Winter rendered page in and render it inside the Backend component. I've wrapped the storm.css & winter.css files in .winter-portal so the css is isolated to only the Winter rendered page.

The menu is now a Vue component as a child of the backend and data is being passed in via root props.

A lot of stuff is broken currently.

My main goal is to add functionality for creating tailwind patch files for plugins to generate against the tailwind ui plugin's tailwind file, so that plugins can effeciently render their own tailwind css.

[LukeTowers]

@bennothommo can we have your magic to mock up a pretty revamp of this skin that @jaxwilko can implement?