docs: migrate UI docs (#13245)

* docs: create a new UI docs project (#13233)

* docs: create a new UI docs project

* fix installation errors

* docs: migrate UI docs content to new project (#13241)

* Fix content

* added examples for some components

* finish adding examples

* lint fix

* fix build errors

* delete empty files

* path fixes + refactor

* fix build error

www/apps/ui/specs/examples/toaster-dismiss.tsx

@@ -0,0 +1,16 @@
+import { Button, toast } from "@medusajs/ui"
+
+export default function DismissableToaster() {
+  return (
+    <Button
+      onClick={() =>
+        toast.info("Info", {
+          description: "The quick brown fox jumps over the lazy dog.",
+          dismissable: true,
+        })
+      }
+    >
+      Show
+    </Button>
+  )
+}