docs: fix get started guide (#5141)

* docs: fix file ending

* docs: skip optional steps

docs/docs/guides/start/quickstart.mdx

@@ -133,7 +133,9 @@ As a user of the ZITADEL Cloud Customer Portal, you now have the ability to crea
 
 ![Project Created](/img/guides/quickstart/21.png)
 
-### 4. Add Users
+### 4. Add Users (optional)
+
+[Skip optional steps](quickstart/#7-create-an-application-in-your-project) and jump directly to the create application step.
 
 1. To add users, click on “Users” at the top menu. You will see that the user you already created is listed as a user here.  Click on the “New” button to create a new user.
 
@@ -151,7 +153,7 @@ As a user of the ZITADEL Cloud Customer Portal, you now have the ability to crea
 
 ![User Info](/img/guides/quickstart/29.png)
 
-### 5. Add Roles to your Project
+### 5. Add Roles to your Project (optional)
 
 1. To add roles to your project, click on “Roles” on the left as shown below. Next, click on the “New” button.
 
@@ -577,9 +579,9 @@ In the PKCE flow, the code verifier is a random string generated by the client a
   ```
 
 
-7. Go to index.js and replace ```import './index.css';``` with ```import './style.css'```. Your index.css file should look like this: 
+7. Go to index.js and replace ```import './index.css';``` with ```import './style.css'```. Your index.js file should look like this:
 
-  [src/index.css](https://github.com/zitadel/react-user-authentication/blob/main/src/index.js)
+  [src/index.js](https://github.com/zitadel/react-user-authentication/blob/main/src/index.js)
 
 ```
 import React from 'react';