dashboard_history: further css & markup fixes, removing style overrides & resuing existing styles and markup components

public/sass/_variables.dark.scss

@@ -286,9 +286,6 @@ $footer-link-hover:   $gray-4;
 $diff-label-bg:         $dark-2;
 $diff-label-fg:         $white;
 
-$diff-switch-bg:        $dark-5;
-$diff-switch-disabled:  $gray-1;
-
 $diff-group-bg:         $dark-4;
 $diff-arrow-color:      $white;
 

public/sass/components/edit_sidemenu.scss

@@ -10,7 +10,6 @@
 }
 
 .edit-sidemenu-aside {
-  min-width: 6rem;
   margin-right: $spacer*2;
 }
 

public/sass/pages/_history.scss

@@ -1,30 +1,3 @@
-
-// Diff View
-.history-list {
-  h4 {
-    margin-bottom: 0.75em;
-  }
-
-  .page-container {
-    padding: 0;
-    background: none;
-  }
-
-  .page-sidebar {
-    margin-left: 0;
-    margin-right: 3em;
-  }
-
-  .small.muted { margin-bottom: 0.25em; }
-
-  .ui-list > li  {
-    margin-bottom: 1.5em;
-
-    & > a { padding-left: 15px; }
-    & > a.active { @include left-brand-border-gradient(); }
-  }
-}
-
 // Actual Diff
 #delta {
   margin: 2em 0;
@@ -105,10 +78,6 @@
 
 .diff-item-added, .diff-item-deleted { list-style: none; }
 
-.diff-restore-btn {
-  float: right;
-}
-
 .diff-group {
   background: $diff-group-bg;
   font-size: 16px;