Moves `docker-compose.yaml` to `docker-compose-counter.yaml` and
replaces the default docker-compose.yaml with the example from the
Kompose.io website.
We also rename each file from yml to yaml.
As well as do some slight modifications / formatting to
docker-compose-bundle.dab
This commit updates a few sentences in the README that I thought would
need improving.
Bundles now end with the .dab extension and are named "Distributed
Application Bundles" now. I've updated the README as well as the example
accordingly.