chore(svelte-examples): pull out of lib package (#3363)

* chore(svelte-examples): pull out of lib package

* chore(svelte-examples): cleanup

* chore(examples): add readme files

examples/react/src/main.tsx

@@ -0,0 +1,12 @@
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import App from './App';
+
+import './index.css';
+import '@xyflow/react/dist/style.css';
+
+createRoot(document.getElementById('root') as HTMLElement).render(
+  <StrictMode>
+    <App />
+  </StrictMode>
+);