Update demo

Author: rbrtsmith

README.md

@@ -29,8 +29,8 @@ Nebula CSS also ships with some common yet useful abstractions such as the Flag
 * [Breakpoints](#breakpoints)
 * [Grid](#grid)
 * [Flag](#flag)
-* [Section](#section)
 * [Site-wrap](#site-wrap)
+* [Section](#section)
 * [Lists](#lists)
   * [Bare list](#bare-list)
   * [Inline list](#inline-list)