docs: initial content for Gestures (#22)

Co-authored-by: Nathan Walker <[email protected]>

Author: Ombuweb

content/sidebar.ts

@@ -228,6 +228,10 @@ export default [
         text: 'Dialogs',
         link: '/ui/dialogs',
       },
+      {
+        text: 'Gestures',
+        link: '/ui/gestures',
+      },
       {
         text: 'Image',
         items: [