Update and restructure Azure PostgreSQL integration docs

[alistairmatthews]

The existing Azure PostgreSQL integration document is comprehensive but difficult for beginners. This PR is intended to keep the comprehensive information but make it easier for those who want to get going quickly. I've used Copilot to propagate changes from the new non-Azure PostgreSQL documents to the Azure PostgreSQL ones.

This PR:

• Splits the large integration doc into two: Hosting and Client.
• Adds a getting started short tutorial.
• Adds a Properties of the Azure PostgreSQL resources section to the client reference docs. This describes what configuration values are injected by the WithReference() method.

[Copilot]

Pull request overview

This pull request restructures the Azure PostgreSQL integration documentation from a single comprehensive document into three focused documents (Get Started, Hosting, and Client), following the same pattern as the non-Azure PostgreSQL documentation and other split integrations in the codebase.

Changes:

• Split the monolithic azure-postgresql.mdx file into three separate documents: a getting started guide, a hosting integration reference, and a client integration reference
• Updated all navigation structures (sidebar, integration-docs.json) and added a redirect for the old URL
• Added comprehensive documentation of the properties injected by WithReference() in the client reference

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
integration-docs.json	Updated package mappings to point to the new get-started page
aspire-9.mdx	Updated reference link to the new get-started page
overview.mdx	Updated table reference to the new get-started page
azure-postgresql-host.mdx	New hosting integration reference document with resource management and provisioning details
azure-postgresql-get-started.mdx	New getting started tutorial with multi-language support (C#, Python, JavaScript)
azure-postgresql-client.mdx	New client integration reference with properties documentation and configuration options
azure-postgresql.mdx	Deleted the original monolithic document (content migrated to new files)
integrations.topics.ts	Updated sidebar to display Azure PostgreSQL as collapsible section with three sub-pages
redirects.mjs	Added redirect from old URL to new get-started page

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