Docs: Add Editor Starter client-side rendering guide

[JonnyBurger]

Summary

• document how to enable client-side rendering in the Editor Starter
• explain the browser rendering flow and tradeoffs compared with Remotion Lambda
• update the Editor Starter navigation and related rendering guidance

Validation

• bun run build
• bun run stylecheck

Closes #9658

Preview

• Editor Starter client-side rendering

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 28, 2026 11:17am
remotion	Building	Preview, Comment	Jul 28, 2026 11:17am

[pullfrog]

✅ No new issues found.

Reviewed changes — adds a client-side rendering guide, fixes a stale font route reference, and updates related Editor Starter pages to reflect the new rendering option.

• Add client-side-rendering.mdx — documents how to enable browser-based rendering via @remotion/web-renderer, the rendering flow, tradeoffs compared to Remotion Lambda, and see-also pointers.
• Fix GET /api/fonts/:name route — corrected the heading and cross-references in backend-routes.mdx, fonts.mdx, and the new page to use the plural route name.
• Update FAQ, dependencies, rendering, setup, and ToC — reworded descriptions to mention client-side rendering as an alternative, added the new page to sidebars.ts, articles.ts, and the Table of Contents.

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