Document env vars and remove theme collapse button

- Expand .env.example with full runtime, cache, Docker, and AI keys
- Add deployment secrets to .gitignore (docker-compose/.env,
  docker/.registry.env)
- Remove VIMEO_ACCESS_TOKEN from compose files; add OAuth redirect URIs
- Load registry credentials from .registry.env in deploy-img.sh
- Fail fast if protected registry lacks auth during pre-checks
- Pass DOCKER_USERNAME/PASSWORD explicitly to WSL in deploy-img.ps1
- Remove inline collapse buttons from themes-nav.component.html

docker-compose/docker-compose.local.yml

@@ -22,7 +22,6 @@ services:
       - GEMINI_API_KEY=${GEMINI_API_KEY}
       - YOUTUBE_API_KEY=${YOUTUBE_API_KEY}
       - YOUTUBE_API_KEYS=${YOUTUBE_API_KEYS}
-      - VIMEO_ACCESS_TOKEN=${VIMEO_ACCESS_TOKEN}
       - TWITCH_CLIENT_ID=${TWITCH_CLIENT_ID}
       - TWITCH_CLIENT_SECRET=${TWITCH_CLIENT_SECRET}
       - TWITCH_REDIRECT_URI=${TWITCH_REDIRECT_URI}