Changed the look of userstreams and standalone annotation page.

Fixed allignment issue with hypothes.is logo in topbar.
Changed font to san-serif font.
Fixed quote allignment with annotation.
Updated link to extension on displayer.pt

h/css/site.scss

@@ -3,13 +3,13 @@
 @import 'compass/css3/images';
 @import 'compass/utilities/color';
 
-$baseFontSize: 18px;
+$baseFontSize: 16px;
 
 @import 'common';
 
 body {
   @extend .noise;
-  font-family: $serifFontFamily;
+  font-family: $sansFontFamily;
 }
 
 header {
@@ -75,7 +75,8 @@ ol {
 
 .topbar .inner {
   @include respond-to(tablets) {
-    max-width: $break-large;
+    padding-left: 3.6em;
     margin: 0 auto;
+    max-width: $break-large;
   }
 }