upgrade tailwind

* moved to vite plugin for tailwind (it's recommended now)
* removed autoprefixer (v4 uses its own CSS thing now)
* postcss.config.js was used to wire up tailwind and autoprefixer, so
  it's gone
* tailwind.config.ts is gone, because v4 stores config in app.css using
  css variables
* fixed some renamed classes

daemon/web/src/lib/components/Modal.svelte

@@ -35,7 +35,7 @@
 {#if shown}
     <div
         class="fixed left-5 right-5 top-5 bottom-5 z-50 bg-white border border-white rounded-md
-		flex flex-col p-2 drop-shadow"
+		flex flex-col p-2 drop-shadow-sm"
     >
         <div class="flex justify-between items-center p-1">
             <span class="text-2xl">{title}</span>