feat(comments): add commento.io comment system (#255)

layouts/partials/comment.html

@@ -100,6 +100,15 @@
                 Please enable JavaScript to view the comments powered by <a href="https://comments.app/">Telegram Comments</a>.
             </noscript>
         {{- end -}}
+
+        {{- /* Commento Comment System */ -}}
+        {{- if $comment.commento.enable -}}
+            <div id="commento"></div>
+            {{- dict "source" "https://cdn.commento.io/js/commento.js" "defer" true | dict "scratch" $.Scratch "data" | partial "scratch/script.html" -}}
+            <noscript>
+                Please enable JavaScript to view the comments powered by <a href="https://commento.io/">Commento</a>.
+            </noscript>
+        {{- end -}}
     </div>
 {{- end -}}