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/radio-group-controlled.tsx

@@ -0,0 +1,31 @@
+import { Label, RadioGroup } from "@medusajs/ui"
+import * as React from "react"
+
+export default function RadioGroupControlled() {
+  const [value, setValue] = React.useState("1")
+  return (
+    <div className="flex flex-col gap-2 items-center">
+      <RadioGroup value={value} onValueChange={setValue}>
+        <div className="flex items-center gap-x-3">
+          <RadioGroup.Item value="1" id="radio_1_controlled" />
+          <Label htmlFor="radio_1_controlled" weight="plus">
+            Radio 1
+          </Label>
+        </div>
+        <div className="flex items-center gap-x-3">
+          <RadioGroup.Item value="2" id="radio_2_controlled" />
+          <Label htmlFor="radio_2_controlled" weight="plus">
+            Radio 2
+          </Label>
+        </div>
+        <div className="flex items-center gap-x-3">
+          <RadioGroup.Item value="3" id="radio_3_controlled" />
+          <Label htmlFor="radio_3_controlled" weight="plus">
+            Radio 3
+          </Label>
+        </div>
+      </RadioGroup>
+      <div className="txt-small text-ui-fg-muted">Selected value: {value}</div>
+    </div>
+  )
+}