More template markup tweak

templates/layout.html

@@ -46,9 +46,9 @@
 {% endif %}
 
 
-<main class="base-container">
+<div class="base-container">
 {% block content %}{% endblock %}
-</main>
+</div>
 <footer class="footer">
 <div>
 	Powered by <a href="https://microblog.pub">microblog.pub</a> <small class="microblogpub-version"><code>{{ microblogpub_version }}</code></small> (<a href="https://github.com/tsileo/microblog.pub">source code</a>) and the <a href="https://activitypub.rocks/">ActivityPub</a> protocol