feat: implement credentials login

implements the credentials login functionality

src/components/user/login-form.tsx

@@ -208,17 +208,7 @@ export default function LoginForm() {
   const formRef = useRef<HTMLFormElement>(null);
 
   if (isSignUp) {
-    return (
+    return <RegisterFormElement setIsSignUp={setIsSignUp} formRef={formRef} />;
-      <RegisterFormElement
-        setIsSignUp={setIsSignUp}
-        formRef={formRef}
-      />
-    );
   }
-  return (
+  return <LoginFormElement setIsSignUp={setIsSignUp} formRef={formRef} />;
-    <LoginFormElement
-      setIsSignUp={setIsSignUp}
-      formRef={formRef}
-    />
-  );
 }