refactor: use useBaseUrl for demo iframe src in Examples page

Author: codeBelt

website/src/pages/examples.tsx

@@ -1,10 +1,13 @@
+import useBaseUrl from '@docusaurus/useBaseUrl';
 import Layout from '@theme/Layout';
 
 export default function ExamplesPage() {
+  const demoUrl = useBaseUrl('/demos/index.html');
+
   return (
     <Layout title="Examples" description="Interactive classy-store examples">
       <iframe
-        src="/classy-store/demos/index.html"
+        src={demoUrl}
         title="Classy Store Interactive Examples"
         style={{width: '100%', height: 'calc(100vh - 60px)', border: 'none'}}
       />