DX-2866: inline start-redis tip so llms.txt includes its content

[CahidArda]

Summary

The start-redis tip was included via a shared <Snippet> component, but the generated
markdown / llms.txt output only contained a link to the snippet file instead of its
content. This inlines the tip directly on every page that used it, and adds it to the
"Connect with @upstash/redis" and "REST API" pages, so LLM-facing exports carry the
full text.

Changes

• Replaced <Snippet file="redis/start-redis-snippet.mdx" /> with the inline <Tip> on all 27 pages that used it (Redis overview/getstarted, features, quickstarts, TS/Python SDK getting-started pages)
• Added the inline tip to redis/howto/connect-with-upstash-redis.mdx and redis/features/restapi.mdx
• Deleted the now-unused _snippets/redis/start-redis-snippet.mdx

[linear-code]

DX-2866

[mintlify]

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Project	Status	Preview	Updated (UTC)
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