Update docs on Cloudflare

The docs on Cloudflare is currently using the degit way of building RedwoodSDK.

Wrangler init also does not surface RedwoodSDK as an option.

<img width="398" height="284" alt="Image" src="https://github.com/user-attachments/assets/1c00e770-905e-47a7-b2b5-9c6ff4455d07" />