Testing default nav order

The `nav_order` fields are removed from the children of the Utilities node, which results in alphabetic order.

docs/utilities/color.md

@@ -2,7 +2,6 @@
 layout: default
 title: Color
 parent: Utilities
-nav_order: 3
 ---
 
 # Color Utilities

docs/utilities/layout.md

@@ -2,7 +2,6 @@
 layout: default
 title: Layout
 parent: Utilities
-nav_order: 2
 ---
 
 # Layout Utilities

docs/utilities/responsive-modifiers.md

@@ -2,7 +2,6 @@
 layout: default
 title: Responsive Modifiers
 parent: Utilities
-nav_order: 1
 ---
 
 # Responsive modifiers

docs/utilities/typography.md

@@ -2,7 +2,6 @@
 layout: default
 title: Typography
 parent: Utilities
-nav_order: 4
 ---
 
 # Typography Utilities