chore: style cleanup

src/pages/dynamic/music/concerts.html

@@ -8,7 +8,7 @@ pagination:
 permalink: "/music/concerts/{% if pagination.pageNumber > 0 %}{{ pagination.pageNumber }}/{% endif %}index.html"
 ---
 {%- if pagination.pageNumber == 0 -%}
-<h2 class="page-header">Concerts</h2>
+<h2>Concerts</h2>
 <p>These are concerts I've attended (not all of them — just the ones I could remember or glean from emails, photo metadata et al). I've been to at least <strong class="highlight-text">{{ concerts | size }}</strong> shows. <a href="/music">You can also take a look at the music I've been listening to lately</a>.</p>
 <hr />
 {%- endif -%}