docs: add note about SvelteKit adapters for non-Deploy targets

[bartlomieju]

Summary

• Adds a tip box in the Svelte tutorial's deploy section pointing users to SvelteKit's adapter docs for non-Deno Deploy platforms (Node.js, Cloudflare, Netlify, self-hosting)

Closes #2893

Test plan

• Verify the tip box renders correctly on the Svelte tutorial page

🤖 Generated with Claude Code

[fibibot]

Adds a :::tip callout in examples/tutorials/svelte.md:295 directing non-Deploy users to SvelteKit's adapter docs. Placement between the "ready for deployment" sentence and the Deno Deploy paragraph reads naturally. https://svelte.dev/docs/kit/adapters resolves and lists the platforms named in the callout (Node, Cloudflare, Netlify, etc.). CI green.

• nit: frontmatter last_modified: 2025-09-29 wasn't bumped — the repo guide expects substantive content changes to refresh it.

[lunadogbot]

The new :::tip Other deployment targets callout is placed after the Deno adapter build output and before the Deno Deploy-specific instructions, so it does not change the tutorial path for Deploy users. https://svelte.dev/docs/kit/adapters returns 200, and both lint and link check and Deploy are green.

• nit: last_modified: 2025-09-29 was not bumped for this content change.