style: store logo size in variable

Author: duanwilliam

website/src/components/Navbar/styles.module.scss

@@ -1,6 +1,7 @@
 @use "@/styles/colors";
 
 $navbar-height: 76px;
+$logo-size: 60px;
 
 .navbar {
   z-index: 10;
@@ -27,8 +28,8 @@ $navbar-height: 76px;
       font-weight: 700;
 
       > img {
-        width: 60px;
-        height: 60px;
+        width: $logo-size;
+        height: $logo-size;
       }
     }
   }