Revert "Added docker-compose.yml for easy apt-cacher-ng startup"

This reverts commit fe45b739871c2eba65ec520e00816299abbfbc5b.

It's probably a bad idea to reference docker containers from unofficial sources

.gitignore

@@ -6,4 +6,3 @@ SKIP
 SKIP_IMAGES
 .pc
 *-pc
-apt-cacher-ng/

README.md

@@ -77,12 +77,6 @@ The following environment variables are supported:
    will not be included in the image, making it safe to use an `apt-cacher` or
    similar package for development.
 
-   If you have Docker installed, you can set up a local apt caching proxy to
-   like speed up subsequent builds like this:
-
-       docker-compose up -d
-       echo 'APT_PROXY=http://172.17.0.1:3142' >> config
-
  * `BASE_DIR`  (Default: location of `build.sh`)
 
    **CAUTION**: Currently, changing this value will probably break build.sh

docker-compose.yml

@@ -1,10 +0,0 @@
-version: '2'
-
-services:
-  apt-cacher-ng:
-    restart: unless-stopped
-    image: sameersbn/apt-cacher-ng:latest
-    ports:
-    - "3142:3142"
-    volumes:
-    - ./apt-cacher-ng:/var/cache/apt-cacher-ng