Add onboarding specific intro to help page

h/static/styles/app.scss

@@ -27,11 +27,6 @@ ol {
   padding-left: 3em;
 }
 
-.bookmarklet {
-  padding: .12em;
-  border: 1px dashed $gray;
-}
-
 #wrapper {
   padding: .72em;
   text-align: center;

h/static/styles/help-page.scss

@@ -130,3 +130,16 @@
 .help-icon {
     @include help-icon;
 }
+
+.bookmarklet {
+  color: $gray-darker;
+  padding: 2px 4px;
+  border: 1px solid;
+  border-radius: 2px;
+  font-size: 13px;
+  cursor: move;
+
+  @include icons {
+    font-size: 12px;
+  }
+}