remove deprecated theme call

Author: FoamyGuy

{{ cookiecutter.__dirname }}/docs/{% if cookiecutter.sphinx_docs in ['y', 'yes'] %}conf.py{% endif %}

@@ -121,7 +121,6 @@ napoleon_numpy_docstring = False
 import sphinx_rtd_theme
 
 html_theme = "sphinx_rtd_theme"
-html_theme_path = [sphinx_rtd_theme.get_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,