docs: Add examples

docs/src/examples/nesting.md

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+---
+pageClass: examples
+
+---
+
+# Nested Nodes
+
+One of the big new features in 0.4.0 is nested nodes. 
+
+You can define parents of a node, which are then nested inside that node. 
+You can also define the boundaries of a node, i.e. if the node can be dragged outside it's parent or if it's contained to the parent 
+or even let Vue Flow extend the area of a node to fit all it's children.
+
+<div class="mt-6">
+  <iframe src="https://codesandbox.io/embed/compassionate-goldberg-h5dsnq?eslint=1&fontsize=14&hidenavigation=1&module=%2Fsrc%2Fcomponents%2FFlow.vue&theme=dark"
+    class="hidden dark:block bg-black h-full w-full min-h-[75vh]"
+    title="Vue Flow: Nested Nodes Example"
+    allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
+    sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
+  ></iframe>
+  <iframe src="https://codesandbox.io/embed/compassionate-goldberg-h5dsnq?eslint=1&fontsize=14&hidenavigation=1&module=%2Fsrc%2Fcomponents%2FFlow.vue&theme=light"
+     class="block dark:hidden h-full w-full min-h-[75vh]"
+      title="Vue Flow: Nested Nodes Example"
+      allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
+      sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
+  ></iframe>
+</div>