Remove unnecessary file

doc/_static/stdpipe-docs.css

-.sphx-glr-script-out {
-    background-color: #EAEAF2;
-}
-
-.sphx-glr-script-out .highlight pre {
-    background-color: #EAEAF2;
-}
-
-div.sphx-glr-download a {
-    background-color: #EAEAF2;
-    border-color: #EAEAF2;
-    background-image: none;
-}

doc/conf.py

@@ -337,6 +337,3 @@ apidoc_output_dir = 'api'
 apidoc_excluded_paths = ['tests']
 apidoc_separate_modules = True
 apidoc_toc_file = None
-
-def setup(app):
-    app.add_css_file("stdpipe-docs.css")