Drop autodoc_typehints from sphinx config

https://github.com/inducer/modepy/pull/38#issuecomment-846472970

doc/conf.py

@@ -77,9 +77,6 @@ todo_include_todos = False
 
 html_theme = "furo"
 
-html_theme_options = {
-        }
-
 intersphinx_mapping = {
     "https://docs.python.org/3/": None,
     "https://numpy.org/doc/stable/": None,
@@ -94,4 +91,3 @@ intersphinx_mapping = {
 }
 
 autoclass_content = "class"
-autodoc_typehints = "description"