Remove the border from the persona logo at the bottom of the /about page.

issue #1964

resources/static/pages/css/style.css

@@ -725,6 +725,8 @@ a.developers:hover {
 }
 a.developers img {
   margin: 0 5px -7px 0;
+  /* The logo at the bottom of the /about page has a border by default */
+  border: none;
 }
 a.developers span {
   color: #53b7fb;