fix: missing sidebar button on a mobile homepage (close: #1355) (#1361)

* Revert "fix: sidebar button should be hidden when there are no sidebars in mobile side (#1159)"

This reverts commit b7f3ac4.

* Fix indent

Author: sinchang

Diff for: lib/default-theme/styles/theme.styl

@@ -178,11 +178,6 @@ th, td
       top 0
     .custom-layout
       padding-top 0
-  &.no-sidebar
-    .sidebar-button
-      display: none
-    .navbar
-      padding-left 1.5rem
 
 
 @media (min-width: ($MQMobile + 1px))