docs(v5): change CDN links to use core@v5 (#2847)

Author: thetaPC

static/demos/api/accordion/index.html

@@ -4,17 +4,17 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Action Sheet</title>
-    <script type="module" src="https://cdn.jsdelivr.net/npm/@ionic/core/dist/ionic/ionic.esm.js"></script>
-    <script nomodule src="https://cdn.jsdelivr.net/npm/@ionic/core/dist/ionic/ionic.js"></script>
-    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@ionic/core/css/ionic.bundle.css" />
+    <script type="module" src="https://cdn.jsdelivr.net/npm/@ionic/core@5/dist/ionic/ionic.esm.js"></script>
+    <script nomodule src="https://cdn.jsdelivr.net/npm/@ionic/core@5/dist/ionic/ionic.js"></script>
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@ionic/core@5/css/ionic.bundle.css" />
     <style>
       :root {
         --ion-safe-area-top: 20px;
         --ion-safe-area-bottom: 22px;
       }
     </style>
     <script type="module">
-      import { actionSheetController } from 'https://cdn.jsdelivr.net/npm/@ionic/core/dist/ionic/index.esm.js';
+      import { actionSheetController } from 'https://cdn.jsdelivr.net/npm/@ionic/core@5/dist/ionic/index.esm.js';
       window.actionSheetController = actionSheetController;
     </script>
   </head>