fix: relocated fullscreen css to fullscreen component

Author: frankpagan

src/css/core.css

@@ -82,18 +82,6 @@ a[icon][filter-sort-direction=desc]:before {
     font-weight: 900;
 }
 
-a[fullscreen]:before {
-    font-family: 'Font Awesome 5 Free';
-    content: "\f065";
-    font-weight: 900;
-}
-
-a[fullscreen=true]:before {
-    font-family: 'Font Awesome 5 Free';
-    content: "\f066";
-    font-weight: 900;
-}
-
 .success {
     background-color: #70ca63;
     color: #fff;