feat: migrate WDK docs to Fumadocs
Created by: ihsraham
Migrates WDK docs from the GitBook tree to the Fumadocs/Next.js site from wdk-docs-migration main.
Summary:
- Replaces the legacy GitBook docs tree with the migrated Fumadocs app.
- Carries over SEO, OG image generation, Inkeep, GTM, sitemap, robots, and API reference tooling.
- Retargets automation from main to develop for this repository.
Validation:
- npm ci
- npm run check:meta
- npm run check:links
- npm run build
- Static smoke on localhost:8081 for /, /sdk/core-module/, /robots.txt, /sitemap.xml, /og/docs/image.webp, GTM, and the Inkeep Ask AI bubble