Remove refresh button css in environments

This css is not used anymore and it als odoes not comply with the
current design system.

app/assets/stylesheets/pages/environments.scss

@@ -98,19 +98,10 @@
   }
 }
 
-.refresh-dashboard-button {
-  margin-top: 22px;
-
-  @media(max-width: map-get($grid-breakpoints, sm)) {
-    margin-top: 0;
-  }
-}
-
 .metric-area {
   opacity: 0.25;
 }
 
-
 .rect-text-metric {
   fill: $white;
   stroke-width: 1;