Rename and organize nav partials for cleaner file structure

docs/_layouts/default.html

@@ -8,7 +8,7 @@
     <a class="sr-only sr-only-focusable" href="#content">Skip to main content</a>
 
     <!-- Docs master nav -->
-    {% include nav-main.html %}
+    {% include nav/main.html %}
 
     <!-- Docs page layout -->
     <div class="bs-docs-header" id="content">
@@ -29,19 +29,19 @@
           <div class="bs-docs-sidebar hidden-print" role="complementary">
             <ul class="nav bs-docs-sidenav">
               {% if page.slug == "getting-started" %}
-                {% include nav-getting-started.html %}
+                {% include nav/getting-started.html %}
               {% elsif page.slug == "css" %}
-                {% include nav-css.html %}
+                {% include nav/css.html %}
               {% elsif page.slug == "components" %}
-                {% include nav-components.html %}
+                {% include nav/components.html %}
               {% elsif page.slug == "js" %}
-                {% include nav-javascript.html %}
+                {% include nav/javascript.html %}
               {% elsif page.slug == "customize" %}
-                {% include nav-customize.html %}
+                {% include nav/customize.html %}
               {% elsif page.slug == "about" %}
-                {% include nav-about.html %}
+                {% include nav/about.html %}
               {% elsif page.slug == "migration" %}
-                {% include nav-migration.html %}
+                {% include nav/migration.html %}
               {% endif %}
             </ul>
             <a class="back-to-top" href="#top">

docs/_layouts/home.html

@@ -8,7 +8,7 @@
     <a class="sr-only sr-only-focusable" href="#content">Skip to main content</a>
 
     <!-- Docs master nav -->
-    {% include nav-main.html %}
+    {% include nav/main.html %}
 
     <!-- Page content of course! -->
     {{ content }}