Static top navbar instead of fixed

This change allows us to simplify the code in both
app.css and cleanup.php

lib/cleanup.php

@@ -99,12 +99,6 @@ add_filter('style_loader_tag', 'roots_clean_style_tag');
  * Add and remove body_class() classes
  */
 function roots_body_class($classes) {
-  // Add 'top-navbar' class if using Bootstrap's Navbar
-  // Used to add styling to account for the WordPress admin bar
-  if (current_theme_supports('bootstrap-top-navbar')) {
-    $classes[] = 'top-navbar';
-  }
-
   // Add post/page slug
   if (is_single() || is_page() && !is_front_page()) {
     $classes[] = basename(get_permalink());