docs: improve AI Assistant (#11208)

* initial implementation

* integrate new ai assistant in other projects + ux improvements

* fix chat window on mobile devices

* fixes to mobile

* allow pre

* change shortcut to i

* improved responsiveness

* align version in navbar

www/apps/api-reference/components/VersionSwitcher/index.tsx

@@ -16,7 +16,7 @@ const VersionSwitcher = () => {
           location.href = process.env.NEXT_PUBLIC_API_V1_URL + pathname
         }}
       />
-      <span className={clsx("text-medusa-fg-subtle")}>V2</span>
+      <span className={clsx("text-medusa-fg-base")}>V2</span>
     </div>
   )
 }