Simple landing page

Before deploying the app, we discovered a critical issue with social network links. When users edit the title of a social link, it breaks the actual link to the network. To fix this, we need to:

1. Allow users to provide their username/handle
2. Enable custom titles for links
3. Update the data structure in the block model

Implementing the Fix

We updated the following components:

1. addSocialLink method: Added a handle item
2. updateBlock method: Ensured the handle is saved when updating
3. UI in the blade template: Added a field for the handle

To handle cases where existing data doesn't have a handle key,...