change: update sphinx config to use rtd as default theme

Author: aaronmarkham

doc/conf.py

@@ -84,10 +84,8 @@ def __getattr__(cls, name):
 autodoc_default_flags = ["show-inheritance", "members", "undoc-members"]
 autodoc_member_order = "bysource"
 
-if "READTHEDOCS" in os.environ:
-    html_theme = "default"
-else:
-    html_theme = "haiku"
+html_theme = "sphinx_rtd_theme"
+
 html_static_path = []
 htmlhelp_basename = "%sdoc" % project