Use warning icon instead of a glyph, move QR styles to comments

-since it's not used anywhere else at the moment

templates/page.html

@@ -3,7 +3,7 @@
 {% block content %}
 {% if page.extra.archive %}
 	<div class="statement-container archive">
-		<strong class="big">⚠ Archived</strong>
+		<strong class="big"><svg viewBox="0 0 16 16" fill="currentColor" height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M8 1.371c-.77 0-1.535.375-1.941 1.125l-4.88 9.063C.364 13.074 1.513 15 3.235 15h9.532c1.722 0 2.87-1.926 2.054-3.441L9.938 2.496C9.535 1.746 8.77 1.371 8 1.371m0 1.926c.064 0 .129.049.18.144l4.879 9.067c.144.262.004.492-.293.492H3.234c-.296 0-.437-.23-.296-.492L7.82 3.44c.051-.095.116-.144.18-.144m-.031 2.672A1 1 0 0 0 7.812 6c-.457.086-.82.535-.812 1v1c-.008.527.473 1 1 1s1.008-.473 1-1V7c.016-.543-.488-1.047-1.031-1.031M8 10c-.55 0-1 .45-1 1s.45 1 1 1 1-.45 1-1-.45-1-1-1"></path></svg> Archived</strong>
 		{{ page.extra.archive | markdown | safe }}
 	</div>
 {% endif %}