Adds configuration for additional site css (daattali#695)

Author: lexicalunit

_config.yml

@@ -101,6 +101,10 @@ footer-link-col: "#404040"
 #footer-img: "/assets/img/bgimage.png"
 #page-img: "/assets/img/bgimage.png"
 
+# You can also include any number of additional CSS assets in every page on your site
+#site-css:
+#  - "/assets/css/my-style.css"
+
 # --- Web Statistics Section --- #
 
 # Fill in your Google Analytics gtag.js ID to track your website using gtag

_includes/head.html

@@ -44,6 +44,12 @@
     {% endfor %}
   {% endif %}
 
+  {% if site.site-css %}
+    {% for css in site.site-css %}
+      <link rel="stylesheet" href="{{ css | relative_url }}">
+    {% endfor %}
+  {% endif %}
+
   <!-- Facebook OpenGraph tags -->
   {% if site.fb_app_id %}
   <meta property="fb:app_id" content="{{ site.fb_app_id }}">