Update docker-compose.yml (#7371)

* removed references to third-party GitHub repository:
•	https://github.com/usbsnowcrash/docker-tor.git
•	https://github.com/usbsnowcrash/docker-privoxy.git

Author: Rajakavitha1

docs/guides/applications/messaging/install-mastodon-on-ubuntu-1604/docker-compose.yml

@@ -81,24 +81,6 @@ services:
       - ./public/system:/mastodon/public/system
       - ./public/packs:/mastodon/public/packs
 
-## Uncomment to enable federation with tor instances along with adding the following ENV variables
-## http_proxy=http://privoxy:8118
-## ALLOW_ACCESS_TO_HIDDEN_SERVICE=true
-#  tor:
-#    build: https://github.com/usbsnowcrash/docker-tor.git
-#    networks:
-#      - external_network
-#      - internal_network
-#
-#  privoxy:
-#    build: https://github.com/usbsnowcrash/docker-privoxy.git
-#    command: /opt/sbin/privoxy --no-daemon --user privoxy.privoxy /opt/config
-#    volumes:
-#      - ./priv-config:/opt/config
-#    networks:
-#      - external_network
-#      - internal_network
-
   nginx:
     build:
       context: ./nginx
@@ -121,4 +103,4 @@ services:
 networks:
   external_network:
   internal_network:
-    internal: true
+    internal: true