Added optional page table of contents

You can use the 'tableofcontents' front matter option to enable or
disable the display of a table of contents. Setting this option will
override the new site-wide parameter 'tableofcontentswordcount' which
will automatically add a table of contents on pages with more than
the specified number of words. Set to '0' to always show a table of
contents, or set to '-1' to never show a table of contents (the
default behaviour).

static/css/themes/light.css

@@ -37,3 +37,8 @@ blockquote {
 .footer {
 	color: #383838;
 }
+
+.table-of-contents {
+	border-color: #E0E0E0;
+	background-color: #FAFAFA;
+}