refactor: js password validation to single file

app/static/js/passwords-match.js

@@ -0,0 +1,8 @@
+(() => {
+  'use strict'
+  const password = document.getElementById("password");
+  const password_validation = document.getElementById("password-confirmation");
+  password.addEventListener('change', (c) => {
+    password_validation.setAttribute("pattern", c.target.value);
+  });
+})()