Update README.md

[moutonjeremy]

Update README.md to introduce Bastion, an Identity and Access Management system, detailing its features, architecture, installation instructions, and usage guidelines.

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Note

Replaces minimal README with a comprehensive Bastion IAM guide covering features, architecture, installation, configuration, usage, API, development, and security.

• Docs:
  • Project Rename: From zotion to Bastion.
  • Comprehensive README:
    • Features: auth/RBAC, SSH bastion, web app proxy, admin UI.
    • Architecture: directory layout and components.
    • Setup: requirements, source build, Docker usage, migrations.
    • Configuration: YAML schema and CLI flags.
    • Usage: HTTP/SSH servers, web UI, admin interface.
    • API: key endpoints for auth, apps, user, admin.
    • Development: tests, migrations commands, cross-platform builds.
    • Web proxy details: URL rewriting, JS interception, CORS, large URLs.
    • Security: password hashing, JWT, session recording, access control.
    • License, contributing, and support links.

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