docs: move wiki articles to docs

docs/add-custom-domain-using-traefik.md

@@ -0,0 +1,42 @@
+Add following labels to *-nginx service
+
+```yaml
+  - "traefik.http.routers.custom-domain.rule=Host(`custom.localhost`)"
+  # Comment the entrypoints label if traefik already has default entrypoint set
+  - "traefik.http.routers.custom-domain.entrypoints=web"
+  - "traefik.http.middlewares.custom-domain.headers.customrequestheaders.Host=mysite.localhost"
+  - "traefik.http.routers.custom-domain.middlewares=custom-domain"
+  # Add following header only if TLS is needed in case of live server, use one of below
+  - "traefik.http.routers.custom-domain.tls.certresolver=myresolver" # For Single Bench
+  - "traefik.http.routers.custom-domain.tls.certresolver=le" # For Docker Swarm
+```
+
+Example:
+
+```yaml
+frontend:
+  image: frappe/erpnext-nginx:${ERPNEXT_VERSION}
+  restart: on-failure
+  environment:
+    - FRAPPE_PY=erpnext-python
+    - FRAPPE_PY_PORT=8000
+    - FRAPPE_SOCKETIO=frappe-socketio
+    - SOCKETIO_PORT=9000
+  labels:
+    - "traefik.enable=true"
+    - "traefik.http.routers.frontend.rule=Host(${SITES})"
+    - "traefik.http.routers.custom-domain.rule=Host(`custom.localhost`)"
+    - "traefik.http.routers.custom-domain.entrypoints=web"
+    - "traefik.http.middlewares.custom-domain.headers.customrequestheaders.Host=mysite.localhost"
+    - "traefik.http.routers.custom-domain.middlewares=custom-domain"
+    # Add following header only if TLS is needed in case of live server
+    - "traefik.http.routers.custom-domain.tls.certresolver=myresolver"
+    - "${ENTRYPOINT_LABEL}"
+    - "${CERT_RESOLVER_LABEL}"
+    - "traefik.http.services.frontend.loadbalancer.server.port=80"
+  volumes:
+    - sites-vol:/var/www/html/sites:rw
+    - assets-vol:/assets:rw
+```
+
+This will add `custom.localhost` as custom domain for `mysite.localhost`