Remove deprecated navbar and header

sass/components/nav.sass

@@ -64,6 +64,8 @@ a.nav-item
       padding: 10px
     &.is-active
       display: block
+  +tablet-only
+    padding-right: 20px
 
 .nav-left
   align-items: stretch
@@ -122,3 +124,10 @@ a.nav-item
   // Modifiers
   &.has-shadow
     box-shadow: 0 2px 3px rgba($black, 0.1)
+  // Responsiveness
+  +touch
+    & > .container,
+    .container > &
+      & > .nav-left
+        & > .nav-item.is-brand:first-child
+          padding-left: 20px