Fix First level order

docs/chapter1/README.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Chapter 1
-nav_order: 2
+nav_order: 3
 has_children: true
 permalink: /docs/chapter-1
 ---

docs/chapter2/README.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Chapter 2
-nav_order: 3
+nav_order: 5
 has_children: true
 permalink: /docs/chapter-2
 ---

docs/section1.md

@@ -1,5 +1,5 @@
 ---
-nav_order: 3
+nav_order: 2
 ---
 # Section 1
 {: .no_toc }

docs/section2.md

@@ -1,5 +1,5 @@
 ---
-nav_order: 2
+nav_order: 4
 ---
 # Section 2
 {: .no_toc }