Fix Disqus

* Use Hugo's built-in disqus template
* Add some extra style
* See #9

assets/scss/style.scss

@@ -562,6 +562,7 @@ a.footnote-return {
   display: flex;
   justify-content: space-between;
   margin-top: 1.5em;
+  margin-bottom: 2.5em;
   font-size: 1.2em;
 
   a {
@@ -579,6 +580,16 @@ a.footnote-return {
   }
 }
 
+// Disqus
+#disqus {
+  margin-top: 2.5em;
+}
+
+.dsq-brlink {
+  display: block;
+  text-align: center;
+}
+
 @media (min-width: 800px) {
   .site-main {
     margin-top: 3em;