add /user/* to robots.txt, style tweak

static/robots.txt

@@ -1,2 +1,3 @@
 User-agent: *
 Disallow: /*?*
+Disallow: /user/*

templates/_followers.html

@@ -2,9 +2,9 @@
 
 <div class="row">
 {% for link in follower_links %}
-  <div class="col-sm-3">{{ link|safe }}</div>
+  <div class="col-sm-4">{{ link|safe }}</div>
 {% else %}
-  <div class="col-sm-3">None</div>
+  <div class="col-sm-4">None</div>
 {% endfor %}
 </div>