docs(wikijs): add stack documentation and navigation entry

docs/docker/wikijs/wikijs.md

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+# Wikijs
+
+## Allgemein
+
+- Image: `linuxserver/wikijs:2.5.312`
+- Port: `3000`
+- Restart Policy: `unless-stopped`
+
+## Volumes
+
+| Host Path | Container Path | Zweck |
+|------------|----------------|--------|
+| /docker-data/wikijs/config | /config | Konfiguration |
+| /docker-data/wikijs/data | /data | Datenbank & Inhalte |
+| /docker-data/wikijs/backup | /backup | Backups |
+
+## Deployment
+
+```bash
+cd /docker/Bruchtal/docker/wikijs
+git pull
+docker compose pull
+docker compose up -d