Replace Nuxt wiki with Outline deployment config

Strip the Nuxt 4 static site and replace with Docker Compose config
for self-hosted Outline wiki (Outline + PostgreSQL 16 + Redis 7).
Adds nginx reverse proxy with WebSocket support and CSS injection,
migration script for existing markdown articles, backup script,
and starter theme CSS.

.env.example

@@ -1,46 +1,3 @@
-# MongoDB Connection
-MONGODB_URI=mongodb://localhost:27017/wiki-ghostguild
-
-# Authentication
-JWT_SECRET=your-secret-key-change-in-production
-JWT_REFRESH_SECRET=your-refresh-secret-change-in-production
-
-# Ghost Guild OAuth Integration
-GHOSTGUILD_API_URL=https://ghostguild.org/api
-GHOSTGUILD_API_KEY=your-api-key
-GHOSTGUILD_CLIENT_ID=your-client-id
-GHOSTGUILD_CLIENT_SECRET=your-client-secret
-GHOSTGUILD_REDIRECT_URI=https://wiki.ghostguild.org/api/auth/callback
-
-# Site Configuration
-SITE_URL=https://wiki.ghostguild.org
-SITE_NAME=Ghost Guild Knowledge Commons
-SITE_DESCRIPTION=A wiki for ghosts! 👻
-
-# Forgejo Integration
-FORGEJO_URL=https://git.ghostguild.org
-FORGEJO_TOKEN=your-forgejo-token
-FORGEJO_REPO=ghostguild/wiki-content
-
-# Search (Meilisearch)
-MEILISEARCH_URL=http://localhost:7700
-MEILISEARCH_KEY=your-master-key
-
-# Email (for notifications)
-EMAIL_FROM=wiki@ghostguild.org
-EMAIL_SMTP_HOST=smtp.example.com
-EMAIL_SMTP_PORT=587
-EMAIL_SMTP_USER=your-smtp-user
-EMAIL_SMTP_PASS=your-smtp-password
-
-# Analytics (Optional)
-PLAUSIBLE_DOMAIN=wiki.ghostguild.org
-PLAUSIBLE_API_KEY=your-plausible-key
-
-# Error Tracking (Optional)
-SENTRY_DSN=your-sentry-dsn
-SENTRY_ENVIRONMENT=production
-
-# Development
-NODE_ENV=development
-DEBUG=false
+# Used by docker-compose.yml for the PostgreSQL service
+# Generate with: openssl rand -hex 16
+POSTGRES_PASSWORD=CHANGE_ME