Add changelog announcing Azure Open Datasets deprecation (#191)

* add azure changelog

* remove s

* change date and move link

* remove extra parens

Author: ch-kr

content/changelog/2025-07-azure-open-datasets-deprecation.md

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+---
+title: Deprecation of gnomAD Data on Azure Open Datasets
+date: 2025-07-22
+order: 1
+---
+
+Starting **August 15, 2025**, gnomAD data will no longer be accessible via Azure Open Datasets due to [Microsoft Azure's planned deprecation of genomic datasets](https://learn.microsoft.com/en-us/azure/open-datasets/dataset-gnomad).
+
+Users who have been relying on Azure Open Datasets for gnomAD data access should transition to accessing data in [Google Cloud Public Datasets](https://cloud.google.com/public-datasets) or the [Registry of Open Data on AWS](https://registry.opendata.aws/). For more information on how to access gnomAD downloadable data, see our [Data](https://gnomad.broadinstitute.org/data) page.