* remove per-yaml license headers in release manifests
* manually insert a license header in release manifests
* add README.md to /kubernetes-manifests indicating they're not ready to use
(and refer to /release instead).
* regenerate manifests
Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>
Closes#75.
### Changelog
Adds 4 scripts to the `hack/` directory for building/pushing images, injecting images tags into static manifests, and tagging new releases. See [hack/README.md](https://github.com/m-okeefe/microservices-demo/tree/release-script/hack).
**Note**: since we have not pushed images yet, the images in the `./release/` manifests are still set to the skaffold defaults (eg. `adservice`).
