DOC: Attempt at fixing theme on RTD (#1019)

docs/conf.py

@@ -20,6 +20,8 @@
 import os
 import sys
 
+import sphinx_rtd_theme
+
 sys.path.insert(0, os.path.abspath('..'))
 
 
@@ -110,7 +112,6 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'default'
 
 # 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
@@ -126,10 +127,8 @@ def setup(app):
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 
-if not on_rtd:  # only import and set the theme if we're building docs locally
-    import sphinx_rtd_theme
-    html_theme = 'sphinx_rtd_theme'
-    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+html_theme = 'sphinx_rtd_theme'
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 
 # -- Options for HTMLHelp output ------------------------------------------