* docs: add official external modules reference page
* chore: remove obsolete docs and basement files
* fix: update robots.txt URLs to docs.bmad-method.org
* fix: generate robots.txt dynamically from site base URL
Replace static robots.txt with an Astro endpoint that uses the
configured site URL, so sitemap references are correct on both
fork deployments and production.
* fix: unify site URL resolution in build-docs.js
build-docs.js had its own hardcoded fallback URL
(bmad-code-org.github.io) instead of using the shared
getSiteUrl() function, causing URL mismatches between
robots.txt, llms.txt, and sitemaps. Now all components
resolve the site URL through the same function. Renamed
site-url.js to .mjs to avoid Node ESM detection warnings.
* fix: correct module names and relocate prompt file
- CIS: "Creative Innovation Suite" → "Creative Intelligence Suite"
- GDS: "Game Dev Suite" → "Game Dev Studio"
- Move _prompt-external-modules-page.md from docs/ to tools/docs/
* refactor: convert build-docs to ESM, eliminate mutable globals
- Convert build-docs.js to build-docs.mjs (CJS → ESM)
- Import getSiteUrl directly, remove async import workaround
- Kill mutable SITE_URL global, call getSiteUrl() where needed
- Clean up Banner.astro variable naming
- Update package.json and CI workflow for .mjs extension
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