Remove fa-sign-out styles

app/assets/stylesheets/fontawesome_custom.scss

@@ -247,10 +247,6 @@
   content: '\f187';
 }
 
-.fa-sign-out::before {
-  content: '\f08b';
-}
-
 .fa-thumb-tack::before {
   content: '\f08d';
 }