Add utterance as partials to support comments.

layouts/partials/comments.html

@@ -0,0 +1,8 @@
+<script src="https://utteranc.es/client.js"
+        repo="breakds/www.breakds.org"
+        issue-term="pathname"
+        label="Comment"
+        theme="github-light"
+        crossorigin="anonymous"
+        async>
+</script>