Issue 5635 - Implement website-default navbar component

static/scss/_navbar.scss

+// This file is part of help.eyeo.com.
+// Copyright (C) 2017 Eyeo GmbH
+//
+// help.eyeo.com is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// help.eyeo.com is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with help.eyeo.com.  If not, see <http://www.gnu.org/licenses/>.
+
+/*******************************************************************************
+ * Navbar component
+ ******************************************************************************/
+
+.navbar
+{
+  @extend .clearfix;
+}
+
+.toggle-navbar-collapse,
+.navbar-collapse
+{
+  padding-top: $navbar-padding-v + ($navbar-padding-v / 2);
+  padding-bottom: $navbar-padding-v + ($navbar-padding-v / 2);
+}
+
+/* .navbar .navbar-branding
+ ****************************************************************************/
+
+.navbar-branding
+{
+  padding-top: $navbar-padding-v;
+  padding-bottom: $navbar-padding-v;
+}
+
+.navbar-branding img
+{
+  height: $navbar-branding-height;
+  vertical-align: text-top;
+}
+
+/* .navbar .toggle-navbar-collapse
+ ****************************************************************************/
+
+.toggle-navbar-collapse
+{
+  @extend .unstyled;
+  display: none;
+  cursor: pointer;
+}
+
+.js .toggle-navbar-collapse
+{
+  display: block;
+
+  @media (min-width: $tablet-breakpoint)
+  {
+    display: none;
+  }
+}
+
+.js .toggle-navbar-collapse .close-label
+{
+  display: none;
+}
+
+.expanded .toggle-navbar-collapse .open-label
+{
+  display: none;
+}
+
+.expanded .toggle-navbar-collapse .close-label
+{
+  display: inline;
+}
+
+/* .navbar .navbar-collapse
+ ****************************************************************************/
+
+.navbar-collapse
+{
+  clear: both;
+  padding-top: 0;
+
+  @media (min-width: $tablet-breakpoint)
+  {
+    float: right;
+    clear: none;
+    padding-top: $navbar-padding-v + ($navbar-padding-v / 2);
+  }
+}
+
+[dir="rtl"] .navbar-collapse
+{
+  float: left;
+}
+
+.js .navbar-collapse
+{
+  display: none;
+
+  @media (min-width: $tablet-breakpoint)
+  {
+    display: block;
+  }
+}
+
+.expanded .navbar-collapse
+{
+  display: block;
+  width: 100%;
+}
+
+/* .navbar .nav
+ ****************************************************************************/
+
+.navbar .navbar-nav li
+{
+  margin-bottom: $navbar-padding-v;

[juliandoucette, 2017/11/15 12:56:42]

It's inconvenient that you chose to use margin-bottom here instead of padding
top and bottom because this margin must be overridden in order to create a list
with background-color hover state. Margin-bottom works well for this example
because the navbar and the navbar-collapse are the same color. If they were not,
then there would obviously be space missing above the first link. 

[ire, 2017/11/30 14:01:18]

Done.

+
+  @media (min-width: $tablet-breakpoint)
+  {
+    display: inline-block;
+    margin: 0 0 0 $navbar-padding-v;
+  }
+}
+
+[dir="rtl"] .navbar .navbar-nav li
+{
+  @media (min-width: $tablet-breakpoint)
+  {
+    display: inline-block;
+    margin: 0 $navbar-padding-v 0 0;
+  }
+}
+
+.navbar .navbar-nav li:last-child

[juliandoucette, 2017/11/15 12:56:42]

Why use the paren't padding instead of the child's margin here?

[ire, 2017/11/30 14:01:19]

Done.

+{
+  margin-bottom: 0;
+}
+
+.navbar .navbar-nav a
+{
+  display: block;
+}