[Dev Center] Improve UI for App Deployment Options in Dev Center

[jelveh]

The Dev Center currently offers two methods for deploying apps:

1. Uploading assets (HTML, JS, CSS, etc.)
2. Setting the app's index URL to any URL

While the second option is powerful and appreciated by developers, the current UI does not clearly present both options. This leads to confusion among developers, with many believing that uploading assets is the only way to create apps.

We need to improve the UI to make both deployment methods more understandable and equally visible. This may include:

• Redesigning the app creation/deployment flow
• Adding clear, visual separation between the two methods
• Providing brief explanations or tooltips for each option
• Ensuring that the custom index URL option is as prominent as the asset upload option

[jelveh]

Idea: if user drops a link on the dev center it should just understand they're trying to create an app with that link as its index_url