✂️ Remove references to play-with-docker

...since it's not supported anymore.

Closes #690

slides/containers/labs-async.md

@@ -8,12 +8,11 @@
   - install [Docker CE][docker-ce] or [Podman][podman]
     <br/>(for intermediate/advanced users who prefer the CLI)
 
-  - try platforms like [Play With Docker][pwd] or [KodeKloud]
+  - use an online platform like [KodeKloud]
     <br/>(if you can't/won't install anything locally)
 
 [docker-desktop]: https://docs.docker.com/desktop/
 [podman-desktop]: https://podman-desktop.io/downloads
 [docker-ce]: https://docs.docker.com/engine/install/
 [podman]: https://podman.io/docs/installation#installing-on-linux
-[pwd]: https://labs.play-with-docker.com/
 [KodeKloud]: https://kodekloud.com/free-labs/docker/

slides/containers/links.md

@@ -7,6 +7,5 @@
 - [Docker documentation](https://docs.docker.com/)
 - [Docker on StackOverflow](https://stackoverflow.com/questions/tagged/docker)
 - [Docker on Twitter](https://twitter.com/docker)
-- [Play With Docker Hands-On Labs](https://training.play-with-docker.com/)
 
 .footnote[These slides (and future updates) are on → https://container.training/]

slides/k8s/links.md

@@ -4,14 +4,12 @@ All things Kubernetes:
 
 - [Kubernetes Community](https://kubernetes.io/community/) - Slack, Google Groups, meetups
 - [Kubernetes on StackOverflow](https://stackoverflow.com/questions/tagged/kubernetes)
-- [Play With Kubernetes Hands-On Labs](https://medium.com/@marcosnils/introducing-pwk-play-with-k8s-159fcfeb787b)
 
 All things Docker:
 
 - [Docker documentation](http://docs.docker.com/)
 - [Docker Hub](https://hub.docker.com)
 - [Docker on StackOverflow](https://stackoverflow.com/questions/tagged/docker)
-- [Play With Docker Hands-On Labs](http://training.play-with-docker.com/)
 
 Everything else:
 

slides/shared/pwd.md

@@ -1,19 +0,0 @@
-## Using Play-With-Docker
-
-- Open a new browser tab to [labs.play-with-docker.com](https://labs.play-with-docker.com/)
-
-- Confirm that you're not a robot
-
-- Click on "ADD NEW INSTANCE": congratulations, you have your first Docker node!
-
-- When you will need more nodes, just click on "ADD NEW INSTANCE" again
-
-- Note the countdown in the corner; when it expires, your instances are destroyed
-
-- If you give your URL to somebody else, they can access your nodes too
-  <br/>
-  (You can use that for pair programming, or to get help from a mentor)
-
-- Loving it? Not loving it? Tell it to the wonderful authors,
-  [@marcosnils](https://twitter.com/marcosnils) &
-  [@xetorthio](https://twitter.com/xetorthio)!