Backport some changes and fixes

Return the separator customization that got lost in some commit
Don't blur the nav when it's not visible
Don't scale down the article card when clicking on a tag

templates/partials/head.html

@@ -54,7 +54,7 @@
 		{%- set styles = styles | concat(with=section.extra.styles) %}
 	{%- endif %}
 
-	{%- if not config.extra.debug_no_styles %}
+	{%- if not config.extra.debug.no_styles %}
 		{%- for style in styles %}
 			<link type="text/css" rel="stylesheet" href="{{ get_url(path=style) | safe }}" />
 		{%- endfor %}