Move flex options to a separate Sector

src/editor/config/config.js

@@ -216,11 +216,6 @@ module.exports = {
         buildProps: [
           'float',
           'display',
-          'flex-direction',
-          'flex-wrap',
-          'justify-content',
-          'align-items',
-          'align-content',
           'position',
           'top',
           'right',
@@ -228,6 +223,17 @@ module.exports = {
           'bottom'
         ]
       },
+      {
+        name: 'Flex',
+        open: false,
+        buildProps: [
+          'flex-direction',
+          'flex-wrap',
+          'justify-content',
+          'align-items',
+          'align-content'
+        ]
+      },
       {
         name: 'Dimension',
         open: false,