feat: ✨ Create users

Users migration, model, controller. user_id to links. signup view

app/javascript/controllers/links_controller.js

@@ -4,16 +4,15 @@ export default class extends Controller {
   static targets = ["url", "output"]
 
   onSuccess(event) {
-    event.preventDefault()
-
     const [, , xhr] = event.detail
     this.outputTarget.innerHTML = xhr.response
   }
 
   onError(event) {
-    event.preventDefault()
-
     const [data, ,] = event.detail
-    alert(data.url.join(' '))
+
+    const urlError = `Url: ${data.url.join(' ')}`
+
+    alert(urlError)
   }
 }