Improved navigation

(cherry picked from commit 6684f7c7faa15d6d59df35fbff9ea6666634d754)

_includes/nav.html

-<ul class="navigation-list">
+<ul class="nav-list">
   {%- assign pages_list = site.html_pages | sort:"nav_order" -%}
   {%- for node in pages_list -%}
     {%- unless node.nav_exclude -%}
       {%- if node.parent == nil -%}
-        <li class="navigation-list-item{% if page.url == node.url or page.parent == node.title or page.grand_parent == node.title %} active{% endif %}">
+        <li class="nav-list-item{% if page.url == node.url or page.parent == node.title or page.grand_parent == node.title %} active{% endif %}">
           {%- if page.parent == node.title or page.grand_parent == node.title -%}
             {%- assign first_level_url = node.url | absolute_url -%}
           {%- endif -%}
-          <a href="{{ node.url | absolute_url }}" class="navigation-list-link{% if page.url == node.url %} active{% endif %}">{{ node.title }}</a>
+          <a href="{{ node.url | absolute_url }}" class="nav-list-link{% if page.url == node.url %} active{% endif %}">{{ node.title }}</a>
           {%- if node.has_children -%}
             {%- assign children_list = site.html_pages | where: "parent", node.title | sort:"nav_order" -%}
-            <ul class="navigation-list-child-list ">
+            <ul class="nav-list-child-list ">
             {%- for child in children_list -%}
-              <li class="navigation-list-item {% if page.url == child.url or page.parent == child.title %} active{% endif %}">
+              <li class="nav-list-item {% if page.url == child.url or page.parent == child.title %} active{% endif %}">
                 {%- if page.url == child.url or page.parent == child.title -%}
                   {%- assign second_level_url = child.url | absolute_url -%}
                 {%- endif -%}
-                <a href="{{ child.url | absolute_url }}" class="navigation-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
+                <a href="{{ child.url | absolute_url }}" class="nav-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
                 {%- if child.has_children -%}
                   {%- assign grand_children_list = site.html_pages | where: "parent", child.title | sort:"nav_order" -%}
-                  <ul class="navigation-list-child-list">
+                  <ul class="nav-list-child-list">
                   {%- for grand_child in grand_children_list -%}
-                    <li class="navigation-list-item {% if page.url == grand_child.url %} active{% endif %}">
-                      <a href="{{ grand_child.url | absolute_url }}" class="navigation-list-link{% if page.url == grand_child.url %} active{% endif %}">{{ grand_child.title }}</a>
+                    <li class="nav-list-item {% if page.url == grand_child.url %} active{% endif %}">
+                      <a href="{{ grand_child.url | absolute_url }}" class="nav-list-link{% if page.url == grand_child.url %} active{% endif %}">{{ grand_child.title }}</a>
                     </li>
                   {%- endfor -%}
                   </ul>

_sass/navigation.scss

 //
 // Main nav, breadcrumb, etc...
 //
-.navigation-list {
+
+.nav-list {
   padding: 0;
   margin-top: 0;
   margin-bottom: 0;
   list-style: none;
 }
 
-.navigation-list-child-list {
+.nav-list-child-list {
   padding-left: $sp-3;
   list-style: none;
 
-  .navigation-list-link {
+  .nav-list-link {
     color: $nav-child-link-color;
   }
 
-  .navigation-list-item {
+  .nav-list-item {
     position: relative;
 
     &::before {
@@ -35,7 +36,7 @@
   }
 }
 
-.navigation-list-item {
+.nav-list-item {
   @include fs-4;
   margin: 0;
 
@@ -43,18 +44,18 @@
     @include fs-3;
   }
 
-  .navigation-list-child-list {
+  .nav-list-child-list {
     display: none;
   }
 
   &.active {
-    .navigation-list-child-list {
+    .nav-list-child-list {
       display: block;
     }
   }
 }
 
-.navigation-list-link {
+.nav-list-link {
   display: block;
   padding-top: $sp-1;
   padding-bottom: $sp-1;