Remove deprecated fa- styles

app/assets/stylesheets/fontawesome_custom.scss

@@ -43,10 +43,6 @@
   content: '\f0eb';
 }
 
-.fa-circle::before {
-  content: '\f111';
-}
-
 .fa-thumb-tack::before {
   content: '\f08d';
 }
@@ -62,24 +58,3 @@
 .fa-check-square-o::before {
   content: '\f046';
 }
-
-.sr-only {
-  position: absolute;
-  width: 1px;
-  height: 1px;
-  padding: 0;
-  margin: -1px;
-  overflow: hidden;
-  clip: rect(0, 0, 0, 0);
-  border: 0;
-}
-
-.sr-only-focusable:active,
-.sr-only-focusable:focus {
-  position: static;
-  width: auto;
-  height: auto;
-  margin: 0;
-  overflow: visible;
-  clip: auto;
-}