templates: Fix overview layout.

`min-width` is officially a bit undefined and a hack but it actually
works so for now, we'll use it.

Closes #47

puppetboard/templates/index.html

@@ -57,7 +57,7 @@
         <table class='dashboard table table-striped table-condensed'>
             <thead>
               <tr>
-              <th style="width:220px;">Status</th>
+              <th style="min-width:220px;">Status</th>
               <th style="width:600px;">Hostname</th>
               <th style="width:120px;"></th>
               </tr>