make icons macros instead of svg files

app/templates/topics/topic.html

@@ -1,4 +1,5 @@
 {% from 'common/macros.html' import pager, timestamp %}
+{% from 'common/icons.html' import icn_bookmark, icn_lock, icn_sticky %}
 {% extends "base.html" %}
 {% block title %}browsing topic {{ topic['name'] }}{% endblock %}
 {% block content %}
@@ -33,7 +34,7 @@
     <div class="thread">
       <div class="thread-sticky-container contain-svg">
         {% if thread['is_stickied'] %}
-          <img src="/static/misc/sticky.svg">
+          {{ icn_sticky() }}
           <i>Stickied</i>
         {% endif %}
       </div>
@@ -56,7 +57,7 @@
       </div>
       <div class="thread-locked-container contain-svg">
         {% if thread['is_locked'] %}
-          <img src="/static/misc/lock.svg">
+          {{ icn_lock() }}
           <i>Locked</i>
         {% endif %}
       </div>