docs: remove dead-end Next steps placeholder in start/local-deploy - #28099

Summary

The getting-started page docs/start/local-deploy.md ended with a literal placeholder under ## Next steps:

TODO: Add link to next page.

This dead-ends the day-zero onboarding golden path. Found in the DOCS-637 runtime drift sweep.

Fix

Remove the placeholder ## Next steps section. The docs/start/ section is rendered by Fumadocs, which auto-generates next/previous navigation from sidebar order, so a manual "Next steps" section is redundant here.

For review

• Approach choice. I removed the section rather than inserting a curated link, per the Fumadocs auto-nav behavior. If you'd rather keep a curated link (the getting-started order is local-deploy → first-template → first-workspace, so the target would be Your first template), say so and I'll swap the removal for a link.
• Mixed convention (out of scope here, flagging for a follow-up). The three docs/start/ pages are inconsistent: first-template.md keeps a curated ## Next steps (→ creating-templates.md), first-workspace.md has none, and local-deploy.md had this placeholder. Worth standardizing on one pattern (all curated links, or all relying on auto-nav) in a separate change.
• I couldn't build the Fumadocs site from this repo to visually confirm the auto-nav renders for docs/start/ (these files aren't in docs/manifest.json), so the auto-nav assumption rests on your note about how the section is wired.

Linear: https://linear.app/codercom/issue/DOCS-648

This PR was created with AI assistance (Coder Agents).