[mattsenicksigma]

Summary

• Install snippet now points at sigmacomputing/dbt-sigma-workbook instead of Matts52/dbt-sigma-workbook.
• Links to the data models package now point at sigmacomputing/dbt-sigma-data-model (previously Matts52/dbt-sigma-data-models).
• Same link fix in `integration_tests/README.md`.

Not changed

• The "Not on the dbt Package Hub yet; install from git" line stays until the packages are indexed; it should then become a hub package: / version: snippet.
• integration_tests/packages.yml still pins the data models package at Matts52/dbt-sigma-data-models (the commit also exists in the sigmacomputing repo).

Test plan

• README links resolve

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