ci(github): respect path prefix in css image references

Author: timmywil

_includes/layouts/base.njk

@@ -25,6 +25,15 @@
     <style>
       {% getBundle "css" %}
     </style>
+    {# These are in the njk so the path prefix is respected #}
+    {%- css %}
+    body {
+      background: url({{ '/img/body_bg.jpg' | htmlBaseUrl }}) no-repeat center 80px;
+    }
+    a.extlink .icon {
+      background: url({{ '/img/extlink.png' | htmlBaseUrl }}) 0 50% no-repeat;
+    }
+    {% endcss %}
     {#- Renders the CSS bundle using a separate file, if you can't set CSP directive style-src: 'unsafe-inline' #}
     {# <link rel="stylesheet" href="{% getBundleFileUrl 'css' %}"> #}
   </head>

public/css/index.css

@@ -93,9 +93,6 @@ html:before {
   );
   z-index: -1;
 }
-body {
-  background: url(/img/body_bg.jpg) no-repeat center 80px;
-}
 
 /* Banner */
 .banner {
@@ -544,7 +541,6 @@ footer a[href]:active {
 }
 a.ext-link .icon {
   padding-left: 15px;
-  background: url(/img/extlink.png) 0 50% no-repeat;
 }
 
 @media (max-width: 919px) {