Summary

This PR consolidates and modernizes the Trusted Server documentation, improving organization, adding new content, and setting up proper formatting tooling.

Changes

Documentation Restructuring

• Simplified README.md - Condensed from 250+ lines to ~50 lines, now pointing to the full documentation site
• Consolidated configuration docs - Merged configuration-reference.md and environment-variables.md into an expanded configuration.md
• Moved onboarding content - Relocated docs/ONBOARDING.md to docs/guide/onboarding.md with updates
• Expanded APS integration - Moved docs/guide/aps.md content into docs/guide/integrations/aps.md

New Documentation

• docs/roadmap.md - Project roadmap
• docs/business-use-cases.md - Business value documentation
• docs/guide/fastly.md - Fastly-specific deployment guide
• docs/guide/proxy-signing.md - Proxy signing documentation
• .env.example - Example environment configuration

Formatting & Tooling

• Added Prettier config (.prettierrc, .prettierignore) to docs
• Added ESLint config (eslint.config.js, tsconfig.json) to docs
• Added format-docs job to CI workflow
• Updated VitePress config to dynamically read tool versions from .tool-versions

Deleted Files (consolidated elsewhere)

• docs/ONBOARDING.md → docs/guide/onboarding.md
• docs/guide/configuration-reference.md → merged into configuration.md
• docs/guide/environment-variables.md → merged into configuration.md
• docs/guide/aps.md → merged into integrations/aps.md

Minor Updates

• Standardized YAML/JSON quote style in GitHub workflows
• Updated various integration docs (Didomi, Lockr, Prebid, etc.)
• Improved navigation structure in VitePress sidebar

Stats

• 53 files changed
• +4,827 insertions / -4,386 deletions

Test Plan

• Verify docs build successfully with npm run build in docs/
• Verify formatting passes with npm run format and npm run lint
• Check all internal links resolve correctly
• Review navigation sidebar structure in local previ