Remove the old `docker-compose` example

Signed-off-by: mervyn <6359152+reply2future@users.noreply.github.com>

contrib/docker/docker-compose.yml

@@ -1,66 +0,0 @@
-# This compose file is compatible with Compose itself, it might need some
-# adjustments to run properly with stack.
-
-version: '3'
-
-services:
-
-  synapse:
-    build:
-        context: ../..
-        dockerfile: docker/Dockerfile
-    image: docker.io/matrixdotorg/synapse:latest
-    # Since synapse does not retry to connect to the database, restart upon
-    # failure
-    restart: unless-stopped
-    # See the readme for a full documentation of the environment settings
-    # NOTE: You must edit homeserver.yaml to use postgres, it defaults to sqlite
-    environment:
-      - SYNAPSE_CONFIG_PATH=/data/homeserver.yaml
-    volumes:
-      # You may either store all the files in a local folder
-      - ./files:/data
-      # .. or you may split this between different storage points
-      # - ./files:/data
-      # - /path/to/ssd:/data/uploads
-      # - /path/to/large_hdd:/data/media
-    depends_on:
-      - db
-    # In order to expose Synapse, remove one of the following, you might for
-    # instance expose the TLS port directly:
-    ports:
-      - 8448:8448/tcp
-    # ... or use a reverse proxy, here is an example for traefik:
-    labels:
-      # The following lines are valid for Traefik version 1.x:
-      - traefik.enable=true
-      - traefik.frontend.rule=Host:my.matrix.Host
-      - traefik.port=8008
-      # Alternatively, for Traefik version 2.0:
-      - traefik.enable=true
-      - traefik.http.routers.http-synapse.entryPoints=http
-      - traefik.http.routers.http-synapse.rule=Host(`my.matrix.host`)
-      - traefik.http.middlewares.https_redirect.redirectscheme.scheme=https
-      - traefik.http.middlewares.https_redirect.redirectscheme.permanent=true
-      - traefik.http.routers.http-synapse.middlewares=https_redirect
-      - traefik.http.routers.https-synapse.entryPoints=https
-      - traefik.http.routers.https-synapse.rule=Host(`my.matrix.host`)
-      - traefik.http.routers.https-synapse.service=synapse
-      - traefik.http.routers.https-synapse.tls=true
-      - traefik.http.services.synapse.loadbalancer.server.port=8008
-      - traefik.http.routers.https-synapse.tls.certResolver=le-ssl
-
-  db:
-    image: docker.io/postgres:12-alpine
-    # Change that password, of course!
-    environment:
-      - POSTGRES_USER=synapse
-      - POSTGRES_PASSWORD=changeme
-      # ensure the database gets created correctly
-      # https://matrix-org.github.io/synapse/latest/postgres.html#set-up-database
-      - POSTGRES_INITDB_ARGS=--encoding=UTF-8 --lc-collate=C --lc-ctype=C
-    volumes:
-      # You may store the database tables in a local folder..
-      - ./schemas:/var/lib/postgresql/data
-      # .. or store them on some high performance storage for better results
-      # - /path/to/ssd/storage:/var/lib/postgresql/data