Restructure macros

- Split macros.html in per-edition files
- Create new snippets.html macro file with utterances snippet
- Move support.html to snippets.html as new macro
- Create new `latest_post` macro in 2nd edition macros.html

blog/templates/edition-2/page.html

@@ -1,6 +1,7 @@
 {% extends "edition-2/base.html" %}
 
-{% import "macros.html" as macros %}
+{% import "edition-2/macros.html" as macros %}
+{% import "snippets.html" as snippets %}
 
 {% block title %}{{ page.title }} | {{ config.title }}{% endblock title %}
 {% block header %}
@@ -75,7 +76,7 @@
 
     <div class="post-footer-support">
         <h2>Support Me</h2>
-        {% include "support.html" %}
+        {{ snippets::support() }}
     </div>
 
     <hr>
@@ -98,7 +99,7 @@
         </p>
         {% endif %}
 
-        {{ macros::utterances() }}
+        {{ snippets::utterances() }}
     </section>
 
     <aside class="page-aside-right">