Move basic header styles to theme file

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/header.scss

@@ -6,14 +6,12 @@ header {
   &.navbar-gitlab {
     margin-bottom: 0;
     min-height: 40px;
+    border: none;
 
     .navbar-inner {
-      background: #F1F1F1;
-      border-bottom: 1px solid #DDD;
       filter: none;
 
       .nav > li > a {
-        color: $style_color;
         font-size: 14px;
         line-height: 32px;
         padding: 6px 10px;
@@ -248,8 +246,6 @@ header {
     float: left;
     height: 46px;
     width: 2px;
-    background: white;
-    border-left: 1px solid #DDD;
     margin-left: 10px;
     margin-right: 10px;
   }

app/assets/stylesheets/sections/nav.scss

@@ -3,7 +3,7 @@
   margin: 20px 0;
   margin-top: 0;
   padding-top: 4px;
-  border-bottom: 1px solid #E1E1E1;
+  border-bottom: 1px solid #E9E9E9;
 
   ul {
     padding: 0;

app/assets/stylesheets/themes/ui_basic.scss

@@ -4,11 +4,21 @@
  *
  */
 .ui_basic {
-  .separator {
-    background: #F9F9F9;
-    border-left: 1px solid #DDD;
+  header {
+    &.navbar-gitlab {
+      .navbar-inner {
+        background: #F1F1F1;
+        border-bottom: 1px solid #DDD;
+        .nav > li > a {
+          color: $style_color;
+        }
+        .separator {
+          background: #F9F9F9;
+          border-left: 1px solid #DDD;
+        }
+      }
+    }
   }
-
   .main-nav {
     background: #FFF;
   }