Add .env api url

src/utils/register.js

@@ -4,7 +4,7 @@ export default async function register(email, password, name, lastname) {
     const csrfToken = await getXSRFToken();
 
     try {
-        const response = await fetch('http://localhost:8000/api/users/register', {
+        const response = await fetch(`http://${import.meta.env.VITE_API_URL}/api/users/register`, {
             method: 'POST',
             credentials: 'include',
             headers: {