Change default nav to be in same file as other nav data

Author: igorkorenfeld

404.html

@@ -3,7 +3,7 @@
 permalink: /404.html
 ---
 
-<h1><strong>404: Page not found</strong></h1>
+<h1>404: Page not found</h1>
   <p>
     If you typed the URL directly, check your spelling and capitalization. Our URLs look like this: <strong>https://guides.18f.gov/agile/introduction/.</strong>
   </p>

_data/navigation.yaml

@@ -110,3 +110,7 @@ ux-guide:
     url: /ux-guide/research/
   - name: Design
     url: /ux-guide/design/
+
+default:
+  - name: 18F Guides home
+    url: https://18f.gsa.gov/guides/

_data/site.yaml

@@ -14,10 +14,6 @@ dap:
 ga:
   ua: UA-48605964-19
 
-# Site Navigation
-primary_navigation:
-  - name: Home
-    url: /
 
 # secondary_navigation:
 #  - name: Secondary link

_includes/layouts/base.html

@@ -17,7 +17,7 @@
     {% if tags %}
       {% assign primary_navigation = navigation[tags] %}
     {% else %}
-      {% assign primary_navigation = site.primary_navigation %}
+      {% assign primary_navigation = navigation['default'] %}
     {% endif %}
 
     {% include "menu.html" secondary_navigation: site.secondary_navigation %}