mention mailing list and fix CSS typo

docs/_static/css/site.scss

@@ -180,6 +180,14 @@ main {
       margin-top: 0;
     }
 
+    p + p {
+      margin-top: 1em;
+    }
+
+    p + p:last-child {
+      margin-top: 0;
+    }
+
     li {
       list-style-type: none;
     }
@@ -275,7 +283,7 @@ main {
     pre, code {
       color: rgb(77, 77, 76);
       font-size: 12px;
-      font-family: Monaco, Menlo, Consolas, monospaced;
+      font-family: Monaco, Menlo, Consolas, monospace;
     }
 
     .highlight {

docs/index.html

@@ -50,6 +50,10 @@
         <code>#isso</code></a> on <a href="http://freenode.net/">Freenode</a>
         or open an issue on <a href="https://github.com/posativ/isso/issues">GitHub</a>.
     </p>
+    <p>
+        Or join the <a href="http://librelist.com/browser/isso/">mailing list</a>,
+        just send an email to <a href="mailto:isso@librelist.com">isso@librelist.com</a>.
+    </p>
     {% include "searchbox.html" %}
     </div>