readthedocs: overriding layout.html wasn't working, switch to overriding page.html

inspired by readthedocs/readthedocs.org#152 . 10y old, and still feels like a hack, but I dunno.

also related:

Author: snarfed

docs/_templates/layout.html

@@ -1,4 +1,4 @@
-{% extends "!layout.html" %}
+{% extends "layout.html" %}
 
 {%- block navigation %}
 

docs/conf.py

@@ -191,9 +191,9 @@
 #html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
-html_sidebars = {
-  '**': ['description.html', 'localtoc.html', 'searchbox.html'],
-}
+# html_sidebars = {
+#   '**': ['description.html', 'localtoc.html', 'searchbox.html'],
+# }
 
 # These folders are copied to the documentation's HTML output
 html_static_path = ['_static']