chore(examples): add overview, cleanup

example/src/TouchDevice/index.tsx

@@ -42,6 +42,7 @@ const TouchDeviceFlow = () => {
       onConnect={onConnect}
       onNodesChange={onNodesChange}
       onEdgesChange={onEdgesChange}
+      className="touchdevice-flow"
     />
   );
 };

example/src/TouchDevice/touch-device.css

@@ -1,11 +1,11 @@
-.react-flow .react-flow__handle {
+.touchdevice-flow .react-flow__handle {
   width: 20px;
   height: 20px;
   border-radius: 3px;
   background-color: #9f7aea;
 }
 
-.react-flow__handle.connecting {
+.touchdevice-flow .react-flow__handle.connecting {
   animation: bounce 1600ms infinite ease-out;
 }