Fix two bugs from remote: service name and IPv6 DNS ...

- Rename aegis-gateway back to aegis — envoy.yaml connects to hostname
  'aegis', renaming broke xDS entirely (Envoy got zero dynamic config)
- Add DNS Lookup Family V4_ONLY to tutorial cluster step — host.docker.internal
  resolves IPv6-first on Mac/Docker Desktop, causing connection failures
  to IPv4-only containers

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Use standalone whoami container with host.docker.internal ...

Runs whoami independently with a published port (8081:80) instead of
adding it to the Aegis docker-compose.yml. Envoy reaches it via
host.docker.internal:8081 — matches real-world usage where services
are not in the same Docker network as the gateway.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Simplify Step 1: add whoami to existing docker-compose.yml ...

No override file, no separate directory needed. User already has aegis
+ envoy running from getting-started — whoami just joins the same
Compose network by being in the same file.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Fix Step 1: use docker-compose.override.yml instead of cat append ...

cat >> appended after the volumes: block, producing invalid YAML.
Override file is the correct pattern — Docker merges it automatically
without touching the original docker-compose.yml.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Make tutorial steps fully copy-paste executable ...

- Step 1: replace manual docker-compose.yml edit with cat >> heredoc + docker compose up
- Step 5: replace UI download button with curl http://localhost:8765/api/certs/ca
- Add PowerShell commands for Windows CA trust

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Overhaul docs for auto-bootstrap, Local CA, and whoami tutorial ...

- Remove starter.json (no longer needed — gateway auto-bootstraps on first boot)
- Add envoy/envoy.yaml static bootstrap config
- Fix docker-compose.yml to use envoy.yaml instead of starter.json
- Update README: fix quick start flow, add Local CA section, add tutorial link
- Rewrite getting-started.md: auto-bootstrap, Local CA, bring-your-own-CA
- Update envoy-config.md: replace import section with auto-bootstrap explanation
- Add docs/tutorial-whoami-local-https.md: end-to-end local HTTPS with whoami
- Add configs/README.md: clarify configs dir purpose

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>