update assets_modern_data_stack example readme

[yuhan]

Summary & Motivation

port over from https://github.com/dagster-io/quickstart-mds to prep the work that moves nux quickstart examples back to mono repo. (https://github.com/dagster-io/quickstart-mds is using assets_modern_data_stack but with more comprehensive readme)

How I Tested These Changes

[vercel]

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated
dagit-storybook	⬜️ Ignored (Inspect)			Dec 14, 2022 at 8:32PM (UTC)
dagster	⬜️ Ignored (Inspect)			Dec 14, 2022 at 8:32PM (UTC)

[yuhan]

Current dependencies on/for this PR:

• master
  • PR update assets_modern_data_stack example readme #11122 👈
    • PR move quickstart_aws back to mono repo #11130
      • PR move quickstart_gcp back to mono repo #11131
        • PR move quickstart_snowflake back to mono repo #11132
          • PR convert-examples-repo-to-defs cloud nux quickstart_aws #11135
            • PR convert-examples-repo-to-defs cloud nux quickstart_gcp #11136
              • PR convert-examples-repo-to-defs cloud nux quickstart_snowflake #11137
    • PR update assets_dbt_python example readme #11126

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