Improved README + Easier configuration.

src/config.js

@@ -1 +1 @@
-export const API_HOST = process.env.REACT_APP_API_HOST || "http://localhost:5500"; // API full address
+export const API_HOST = process.env.REACT_APP_API_HOST || "http://localhost:5000"; // API full address

src/styles/List.css

@@ -94,7 +94,8 @@
   margin: 20px;
   width: 100px;
   height: 100px;
-  transition: opacity 0.3s;
+  transition: opacity 0.3s ease-in-out;
+  will-change: transform, opacity;
 }
 
 .list-entity-content {