* keep both in gitignore, since the default still exist

* tech stack can be installed locally and will be used by app-related
  targets if available
* bumped minimal required npm version to 6.14 for server and client

* readme files for the repository and the app
* makefile ans the main entry and documentation
* remove create-react-app from client code

* not needed since it is served by the backend (./../server)

* to gain more control over dependencies and how things are executed

* PUBLIC_URL should now be provided as env var

* update deps to latest and pin min node & npm version
* checkin lock files
* make server serve client to merge both into one in order to reduce complexity
* adjust CSP accordingly

* applied latest cra-template
* removed react-specific content

* Dockerfile
* k8s resources
* yarn.lock

src: https://github.com/aamirpinger/todo-app-client-server-kubernetes/commit/93be212a344ea910b0a13f1110975bfdfd306f3a