[Docs site] update workers-ai/get-started/dashboard page

[jsparkdev]

Summary

Update previous content that provided incorrect information with the latest information.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[holopin-bot]

Congratulations @jsparkdev, the maintainer of this repository has issued you a holobyte! Here it is: https://holopin.io/holobyte/cm7j0nvxd40660cjy4yn99cwe

This badge can only be claimed by you, so make sure that your GitHub account is linked to your Holopin account. You can manage those preferences here: https://holopin.io/account.
Or if you're new to Holopin, you can simply sign up with GitHub, which will do the trick!