doc: update readme

[feng-tao]

Summary of Changes

update readme given we stop using amundsen internally at dbx.

Tests

Documentation

CheckList

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• [ ] PR title addresses the issue accurately and concisely. Example: "Updates the version of Flask to v1.0.2"
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.
• [ ] PR includes a summary of changes.
• [ ] PR adds unit tests, updates existing unit tests, OR documents why no test additions or modifications are needed.
• [ ] In case of new functionality, my PR adds documentation that describes how to use it.
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[feng-tao]

LGTM

😿

Don't tell me you use DataHub now!

nah, we are building something similar into databricks saas product