Allow <br> and <s> input

lib/PostText.pm

@@ -33,7 +33,11 @@ sub startup($self) {
     $self->helper(hr => sub ($c) {
         state $hr = HTML::Restrict->new(
             filter_text            => 0,
-            strip_enclosed_content => []
+            strip_enclosed_content => [],
+            rules                  => {
+                br => [],
+                s  => []
+            }
             )
     });
 

templates/page/about.html.ep

@@ -27,8 +27,9 @@ This is correct for a multi-line code block:
     }
   </code></pre>
   <p>You can use an actual tab character or four spaces to indent.
-    <strong>Only Markdown is supported, HTML will be filtered
-    out.</strong></p>
+    Only Markdown as well as the HTML tags <code>&lt;br&gt;</code> and
+    <code>&lt;s&gt;</code> are supported. <strong>All other HTML will
+    be filtered out.</strong></p>
   <p>There is a button for users to 'flag' a post for review by a
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     <a href="mailto:swaggboi@slackware.uk">webmaster</a>. There is