Add css to fix fluid layout for index file

app/assets/stylesheets/framework/files.scss

@@ -2,6 +2,14 @@
  * File content holder
  *
  */
+.container-fluid.container-limited.limit-container-width {
+  .file-holder.readme-holder.limited-width-container .file-content {
+    max-width: $limited-layout-width;
+    margin-left: auto;
+    margin-right: auto;
+  }
+}
+
 .file-holder {
   border: 1px solid $border-color;
   border-top: 0;
@@ -17,12 +25,6 @@
 
   &.readme-holder {
     margin: $gl-padding 0;
-
-    &.limited-width-container .file-content {
-      max-width: $limited-layout-width;
-      margin-left: auto;
-      margin-right: auto;
-    }
   }
 
   .file-title {