Yoga Docs: Rename website-next to website (#1613)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1613

So that GitHub links to edit a page point to the right place.

This will fail in OSS build until I switch the directory used by Vercel instance, but I am waiting to do that until ready to land, since that would cause other in progress changes to fail when exported.

Reviewed By: joevilches

Differential Revision: D54837857

website/docs/styling/insets.mdx

@@ -0,0 +1,62 @@
+---
+sidebar_position: 8.5
+---
+
+import Playground from '@site/src/components/Playground';
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# Insets
+
+Insets refer to the position property that you can assign to an edge
+(not to be confused with [position type](/docs/styling/position)) using one of the following
+APIs:
+<Tabs groupId="language">
+<TabItem value="cpp" label="C/C++">
+```cpp
+YGNodeStyleSetPosition(node, edge, position);
+```
+</TabItem>
+<TabItem value="java" label="Java">
+```java
+node.setPosition(edge, position);
+```
+</TabItem>
+<TabItem value="ts" label="Typescript">
+```typescript
+node.setPosition(edge, position);
+```
+</TabItem>
+</Tabs>
+This property will offset the node in a specific way depending on
+what [position type](/docs/styling/position) the node has.
+
+* If the node is static then insets have no effect.
+* If the node is relative then insets will move the node the designated amount
+from where the node would normally be in the container. Each inset property
+is relative to the node's corresponding physical edge. So `YGNodeStyleSetPosition(node, YGEdgeRight, 10.0f)` will offset the node
+so that the right edge is 10 units away from where the right edge would be originally.
+* If the node is aboslute then insets will move the node the designated amount away from
+the node's [containing block](/docs/advanced/containing-block). So `YGNodeStyleSetPosition(node, YGEdgeRight, 10.0f)`
+will offset the node so that the right edge is 10 units away from the [containing block's](/docs/advanced/containing-block)
+right edge.
+
+In the event that a node has a fixed size and opposite insets are defined
+(e.g. a value assigned to the right edge and left edge) then the left and top edge will have priority.
+
+<Playground code={`<Layout config={{useWebDefaults: false}}>
+  <Node
+    style={{
+      width: 200,
+      height: 200,
+    }}>
+    <Node
+      style={{
+        height: 50,
+        width: 50,
+        top: 50,
+        left: 50,
+      }}
+    />
+  </Node>
+</Layout>`} />