fix readthedocs.org builds for sphinx_rtd_theme, copying what circuit…

…python does adafruit/circuitpython#8322

docs/conf.py

@@ -110,22 +110,28 @@
 
 # -- Options for HTML output ----------------------------------------------
 
-# The theme to use for HTML and HTML Help pages.  See the documentation for
-# a list of builtin themes.
-#
-on_rtd = os.environ.get("READTHEDOCS", None) == "True"
-
-if not on_rtd:  # only import and set the theme if we're building docs locally
-    try:
-        import sphinx_rtd_theme
-
-        html_theme = "sphinx_rtd_theme"
-        html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), "."]
-    except:
-        html_theme = "default"
-        html_theme_path = ["."]
-else:
-    html_theme_path = ["."]
+import sphinx_rtd_theme
+
+html_theme = "sphinx_rtd_theme"
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), "."]
+
+
+# # The theme to use for HTML and HTML Help pages.  See the documentation for
+# # a list of builtin themes.
+# #
+# on_rtd = os.environ.get("READTHEDOCS", None) == "True"
+
+# if not on_rtd:  # only import and set the theme if we're building docs locally
+#     try:
+#         import sphinx_rtd_theme
+
+#         html_theme = "sphinx_rtd_theme"
+#         html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), "."]
+#     except:
+#         html_theme = "default"
+#         html_theme_path = ["."]
+# else:
+#     html_theme_path = ["."]
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,