remove css

src/client/styles/scss/_layout_growi.scss

@@ -3,11 +3,6 @@
 .growi {
   .content-main {
     padding: 0;
-    &.no-toc-content {
-      max-width: 960px;
-      margin-right: auto;
-      margin-left: auto;
-    }
   }
 
   .top-of-table-contents {