Add option to layout.html

Author: Blendify

sphinx_rtd_theme/layout.html

@@ -131,7 +131,7 @@
               toctree is empty. Skip building this for now.
             #}
             {% if 'singlehtml' not in builder %}
-              {% set global_toc = toctree(maxdepth=theme_navigation_depth|int, collapse=theme_collapse_navigation, includehidden=True) %}
+              {% set global_toc = toctree(maxdepth=theme_navigation_depth|int, collapse=theme_collapse_navigation, includehidden=theme_includehidden) %}
             {% endif %}
             {% if global_toc %}
               {{ global_toc }}