[Glitch] Replace flex styling with sensible layout rules

Port ef4d29c879 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/admin.scss

@@ -254,10 +254,8 @@ $content-width: 840px;
 
       &__actions {
         display: inline-flex;
-
+        flex-flow: wrap;
-        & > :not(:first-child) {
+        gap: 5px;
-          margin-left: 5px;
-        }
       }
 
       h2 small {