Use docs_file

docs/_config.yml

@@ -1,6 +1,7 @@
 # Meta
 
 env:           "production"
+docs_file:     "bulma-docs.min"
 
 # Build
 

docs/_includes/head.html

@@ -18,7 +18,7 @@
   {% if page.mdi %}
     <link rel="stylesheet" href="{{ site.data.icons.mdi }}">
   {% endif %}
-  <link rel="stylesheet" href="{{ site.url }}/css/bulma-docs.min.css?v={{ site.time | date: "%Y%m%d%H%M" }}">
+  <link rel="stylesheet" href="{{ site.url }}/css/{{ site.docs_file }}.css?v={{ site.time | date: "%Y%m%d%H%M" }}">
 
   <link rel="canonical" href="{{ page.url | replace:'index.html','' | prepend: site.url }}">
   <link rel="alternate" type="application/rss+xml" title="{{ site.data.meta.title }}" href="{{ "/atom.xml" | prepend: site.url }}">