Clean outlined elements on focus

src/less/website/header.less

@@ -28,6 +28,10 @@
             color: @header-button-hover-color;
             background: @header-button-hover-background;
         }
+
+        &:focus {
+            outline: none;
+        }
     }
 
     h1 {

src/less/website/summary.less

@@ -75,6 +75,10 @@
                 text-decoration: underline;
             }
 
+            a:focus {
+                outline: none;
+            }
+
             &.active > a {
                 color: @sidebar-link-hover-color;
                 background: @sidebar-link-hover-background;