remove deprecated get_html_theme_path() call

Signed-off-by: foamyguy <foamyguy@gmail.com>

Author: FoamyGuy

Diff for: docs/conf.py

@@ -100,7 +100,6 @@
 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,