Force citheme.css to be the default css in the userguide. [ci skip]

Author: jreklund

user_guide_src/source/conf.py

@@ -94,16 +94,17 @@
 # pixels large.
 html_favicon = '_static/favicon.ico'
 
+# The name of an style sheet to use for HTML pages.
+html_style = 'css/citheme.css'
+
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'CodeIgniterdoc'
 
 # If true, the reST sources are included in the HTML build as _sources/name.
 html_copy_source = False
 
 # A list of CSS files.
-html_css_files = [
-	'css/citheme.css',
-]
+html_css_files = []
 
 # A list of JS files.
 html_js_files = [