DOC-429: Split Azure lstk doc into the same v2 multi-page IA

[quetzalliwrites]

Summary

Follows up on #898 (the AWS lstk docs split). azure/developer-tools/lstk.mdx turned out to be a 1556-line near-duplicate of the pre-split AWS content — same commands, config reference, and troubleshooting, since lstk is one CLI shared across products. This replaces it with the same nine-page structure, cross-linked under /azure/developer-tools/lstk/:

• index.mdx, authentication.md, configuration.mdx, lifecycle-commands.md, cloud-and-iac-commands.md, snapshots.md, automation.mdx, setup-and-maintenance.md, faq-and-troubleshooting.md

Azure-specific differences preserved from the original doc (not just a mechanical copy of the AWS content):

• Prerequisites link to the license section of Azure's own Auth Token guide.
• Dropped the "legacy LocalStack CLI is deprecated" tip — Azure never had a legacy CLI to migrate from.
• The Volume mounts example uses a generic init script and type = "azure" instead of AWS's Snowflake-specific example.
• The Docker Compose FAQ answer links to Azure's own installation guide.
• Left the corporate-proxy FAQ and Get Help links pointing at the shared AWS pages, since Azure has no equivalent of either and the original doc already did the same.

Also converted Azure's sidebar "Developer Tools" entry from autogenerate to an explicit array (mirroring AWS's approach) so the nine pages get the same nested "lstk CLI" group, labels, and order rather than relying on autogenerate's folder-naming heuristics.

Linear ticket

https://linear.app/localstack/issue/DOC-429/docs-update-azure-lstk-doc-based-on-new-lstk-v2-ia

Test plan

• npx astro build completes successfully (421 pages built)
• Link validator confirms all internal links are valid
• Scripted verification that all 22 lstk/<page>/#anchor cross-references between the nine new Azure pages resolve to a real heading ID in the built output
• Confirmed no other file in the repo linked to the old /azure/developer-tools/lstk/ single-page anchors, so no redirect or cross-reference sweep is needed

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[quetzalliwrites]

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[quetzalliwrites]

Hey @remotesynth, Maureen approved the new v2 IA for lstk doc, it's already merged in aws product line docs:

• DOC-386
• localstack/localstack-docs#898

Now that we've merged that v2 IA for the aws product line, we should make this update for the azure product line docs too. Since we're not using components after all.... then we're maintaining in each product line? Or let me know if you have another better idea.