Split up docker so that it's easier to maintain

[danwdart]

Use compose to split up everything into factory standard pieces such as a PHP piece, a Node piece, an Nginx piece etc

Makes the images smaller and more reusable

[danwdart]

docker -f Dockerfile-php -t chaplin-php build .
docker -f Dockerfile-node -t chaplin-node build .

etc

[danwdart]

This is now done and makes things a lot easier going forward.