Move key binding docs so they can be more easily found (#1067)

* Move key binding docs so they can be more easily found

* Redirect

docs/docs/key-binding.md

@@ -1,3 +1,7 @@
+---
+sidebar_position: 2
+---
+
 # Key binding
 
 ## Shell

docs/vercel.json

@@ -4,6 +4,11 @@
       "source": "/docs/",
       "destination": "/docs/guide",
       "permanent": true
+    },
+    {
+      "source": "/docs/config/key-binding",
+      "destination": "/docs/key-binding",
+      "permanent": true
     }
   ]
 }