[doc] Allow full webpage width for docs

doc/_static/style.css

+.wy-nav-content {
+    max-width: none;
+}

doc/_templates/layout.html

+{% extends "!layout.html" %}
+{% block extrahead %}
+    <link href="{{ pathto("_static/style.css", True) }}" rel="stylesheet" type="text/css">
+{% endblock %}

doc/conf.py

@@ -168,7 +168,7 @@ html_favicon = 'img/bob-favicon.ico'
 # 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,
 # so a file named "default.css" will overwrite the builtin "default.css".
-#html_static_path = ['_static']
+html_static_path = ['_static']
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.