feat: Use paired styles

Change .list_link style to &.link.

source/screens/demo/examples/game.liquid

@@ -14,7 +14,7 @@ tags:
 				<h1>{{ title }}</h1>
 				<p>Additional name</p>
 			</hgroup>
-			<ul class="list_link">
+			<ul class="link">
 				<li><a href="#new">Neues Spiel</a></li>
 				<li><a href="#continue">Spiel fortsetzen</a></li>
 				<li><a href="#options">Einstellungen</a></li>

source/screens/demo/examples/ui/index.liquid

@@ -12,7 +12,7 @@ tags:
 <div class="sec_main_center">
 	<nav role="doc-toc">
 		<h1>{{ title }}</h1>
-		<ul class="list_link">
+		<ul class="link">
 			{%- for ui in collections.ui -%}
 				<li>
 					<a href="{{ ui.page.url }}">{{ ui.data.title }}</a>