[Infrastructure] Fix demo site compilation issues (Resolves #2200) (#2206)

Author: angelosilvestre

website/lib/homepage/featured_editor.dart

@@ -52,8 +52,8 @@ class _FeaturedEditorState extends State<FeaturedEditor> {
     _composer = MutableDocumentComposer(
       initialSelection: DocumentSelection.collapsed(
         position: DocumentPosition(
-          nodeId: _doc.nodes.last.id, // Place caret at end of document
-          nodePosition: (_doc.nodes.last as TextNode).endPosition,
+          nodeId: _doc.last.id, // Place caret at end of document
+          nodePosition: (_doc.last as TextNode).endPosition,
         ),
       ),
     );

website/pubspec.yaml

@@ -16,6 +16,10 @@ dependencies:
   super_text_layout: ^0.1.0
   url_launcher:
 
+dependency_overrides:
+  super_text_layout:
+    path: ../super_text_layout
+
 dev_dependencies:
   flutter_test:
     sdk: flutter