Use default pygments theme (#68)

Blendify · web-flow · commit 55864868d933 · 2021-05-01T12:20:29.000+02:00
The default theme looks a lot better than the default theme with the green background.
diff --git a/python_docs_theme/theme.conf b/python_docs_theme/theme.conf
@@ -1,7 +1,7 @@
 [theme]
 inherit = default
 stylesheet = pydoctheme.css
-pygments_style = sphinx
+pygments_style = default
 
 [options]
 bodyfont = 'Lucida Grande', Arial, sans-serif
