Change _templates override into a theme "doctrine".

.gitignore

@@ -1,2 +1,3 @@
 en/_exts/configurationblock.pyc
-build
+build
+en/_build

en/_theme/doctrine/theme.conf

@@ -0,0 +1,7 @@
+[theme]
+inherit = basic
+stylesheet = default.css
+pygments_style = sphinx
+
+[options]
+nosidebar = false

en/conf.py

@@ -91,7 +91,7 @@ pygments_style = 'sphinx'
 
 # The theme to use for HTML and HTML Help pages.  Major themes that come with
 # Sphinx are currently 'default' and 'sphinxdoc'.
-html_theme = 'default'
+html_theme = 'doctrine'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -99,7 +99,7 @@ html_theme = 'default'
 #html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
+html_theme_path = ['_theme']
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".