Make Rating/Services/Activities in waypoint popups muted, not bold

Secondary metadata, not something worth visually competing with the actual
description — dropped the bold label weight and colored the whole meta
block the same muted gray already used for category/time elsewhere in the
popup.

public/css/style.css

@@ -458,6 +458,7 @@ html, body {
   margin-top: 8px;
   padding-top: 6px;
   border-top: 1px solid #eee;
+  color: #888;
   font-size: 12px;
   line-height: 1.5;
 }
@@ -467,7 +468,6 @@ html, body {
 }
 
 .gpx-popup__meta-label {
-  font-weight: 600;
   margin-right: 4px;
 }