docs: Update documentation

examples/hedgedoc.example.com/.env

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+########
+# DOCKER
+
+#DOCKER_CONTEXT=
+#DOCKER_HOST=          // Pour déployer sur un serveur distant
+SERVICES_DIR=../..
+COMPOSE_FILE=${SERVICES_DIR}/hedgedoc/docker-compose.yml:${SERVICES_DIR}/hedgedoc/docker-compose.traefik.yml:${SERVICES_DIR}/postgres/docker-compose.yml
+COMPOSE_PROJECT_NAME=hedgedoc_example_com
+
+##########
+# HEDGEDOC
+
+HEDGEDOC_DOMAIN=hedgedoc.example.com
+HEDGEDOC_VOLUME_NAME=hedgedoc_example_com_hedgedoc
+HEDGEDOC_CONTAINER_NAME=hedgedoc_example_com_hedgedoc
+#HEDGEDOC_IMAGE=
+
+# https://docs.hedgedoc.org/configuration/
+#NODE_ENV=
+#CMD_PROTOCOL_USESSL=
+#CMD_ALLOW_GRAVATAR=
+#CMD_ALLOW_FREEURL=
+#CMD_ALLOW_EMAIL_REGISTER=
+CMD_SESSION_SECRET=/ADm6sOuQ/EOhUA+xcmkQOtk9QDhggjsFBKQCLKrC6U=
+#CMD_DEFAULT_PERMISSION=
+#PGID=
+#PUID=
+
+##########
+# POSTGRES
+
+POSTGRES_USER=user
+POSTGRES_PASSWORD=password
+POSTGRES_DB=database
+POSTGRES_VOLUME_NAME=hedgedoc_example_com_postgres
+POSTGRES_CONTAINER_NAME=hedgedoc_example_com_postgres
+#POSTGRES_IMAGE=
+
+#########
+# TRAEFIK
+
+#TRAEFIK_NETWORK_NAME=
+TRAEFIK_ROUTER_NAME=hedgedoc_example_com                     # Don't use char '.'