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/SystemStatsTable.svelte

@@ -36,7 +36,7 @@
 </script>
 
 <div
-    class="flex-1 drop-shadow p-4 flex flex-col gap-2 border rounded-md bg-gray-100 border-gray-100"
+    class="flex-1 drop-shadow-sm p-4 flex flex-col gap-2 border rounded-md bg-gray-100 border-gray-100"
 >
     <p class="text-xl mb-2">System Information</p>
     <table class="table-auto border">