fix section link indentation

Author: Evan You

themes/vue/source/css/page.styl

@@ -88,10 +88,11 @@ $header-height = 40px
         list-style-type none
         margin 0
         line-height 1.8em
+        padding-left 1em
+    .menu-root
         padding-left 0
     .menu-sub
         font-size .85em
-        padding-left 1em
     .sidebar-link
         color $light
         &.current
@@ -106,6 +107,7 @@ $header-height = 40px
     .main-menu
         margin-bottom 20px
         display none
+        padding-left 0
 
 .content
     padding 2.2em 0