Fix E2E Tests

cypress/platform/css1.html

@@ -28,8 +28,8 @@
     end
     A --> B
     </pre>
-    <script src="./mermaid.js"></script>
-    <script>
+    <script type="module">
+      import mermaid from './mermaid.esm.mjs';
       function showFullFirstSquad(elemName) {
         console.log('show ' + elemName);
       }