DOC-339: Rewrite Snowflake Getting Started to mirror AWS v2 and default to lstk

[quetzalliwrites]

Summary

Mirrors the AWS Getting Started rewrite (DOC-12, #606) information architecture for Snowflake: Overview, Installation, Local Development, CI Integration, AI & Agent Workflows, Auth Token, FAQ.

• Overview and Installation are split into separate pages (previously combined into one file titled "Installation" with no landing page). Overview is a new SectionCards landing page; Installation leads with lstk (lstk start --type snowflake), with Docker Compose/CLI as secondary paths.
• Quickstart is decoupled and removed. Its content is folded into a new Local Development page with an explicit, unbroken walkthrough: start the emulator via lstk → connect the Snowflake CLI to a localstack connection profile → run a first query → inspect results in the Web App → clean up. Adds a 301 redirect from the old quickstart URL.
• CI Integration is a new page with lstk-based CI snippets.
• AI & Agent Workflows is a new top-level page centered on the MCP server's localstack-snowflake-client tool.
• Auth Token and FAQ are restructured to match the AWS pattern while keeping Snowflake-specific content (session verify endpoint, SQL API/hostname/image-tag FAQs) that has no AWS equivalent.
• Fixed three tutorial pages whose prerequisite links pointed at the now-split /snowflake/getting-started/ page.

Where this deliberately doesn't mirror AWS 1:1

• No lstk wrapper for the Snowflake CLI. Agents/users run snow directly against its own localstack connection profile — there's no lstk snow proxy the way there's lstk aws/lstk terraform/lstk cdk.
• No per-provider CI guide fan-out. AWS links to dedicated /aws/ci-pipelines/<provider>/ pages; Snowflake only has one consolidated CI page, so CI Integration links there instead of inventing pages that don't exist.
• No claim about Snowflake-specific LocalStack Skills coverage — couldn't verify one way or the other, so the AI & Agent Workflows page omits that bullet rather than guessing.
• Did not reuse AWS's LocalStack/setup-localstack@main GitHub Action example for the CI snippets, since its Snowflake support is unverified; used a plain lstk-based step instead.

Linear: https://linear.app/localstack/issue/DOC-339/docs-snowflake-getting-started-v2-also-making-lstk-default-cli

Test plan

• astro build completes successfully (403 pages)
• starlight-links-validator reports all internal links valid
• No "Quickstart" naming remains anywhere in the Snowflake Getting Started section
• All CLI examples in the 7 nav pages use lstk
• Nav titles/order verified: Overview(1), Installation(2), Local Development(3), CI Integration(4), AI & Agent Workflows(5), Auth Token(6), FAQ(7)

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[quetzalliwrites]

Moving this to draft mode, still want to test and refine it further before going to review round.