SMACK 13: Added slides to intro and link to YouTube

smack-13-docker.md

-SMACK 13: Containers (the part on Docker)
------------------------------------------
+SMACK 13: Containers
+--------------------
 
-This is only a section of the full SMACK 13 that is focused on
-containers in general, and also includes a discussion on Singularity.
+SMACK 13 is focused on
+[Containers](https://en.wikipedia.org/wiki/OS-level_virtualization). It
+starts with an introduction to the concept (in slides), followed by a
+hands-on demonstration of Docker and Apptainer (previously known as
+Singularity).
 
-## What is Docker?
+## Recorded video of SMACK 13:
+
+This SMACK was presented on December 9th, 2021, as [part of IACTalks](http://iactalks.iac.es/talks/view/1530) and a recording of this session is available on YouTube: https://www.youtube.com/watch?v=e6-XBbbAsA8
+
+## Introduction and Apptainer lecture notes
+
+The introduction and lecture notes to demonstrate Apptainer (previously known as Singularity) are available in these slides: https://gitlab.com/makhlaghi/smack-talks-iac/-/raw/master/Slides/smack-13-containers.pdf
+
+## Docker lecture notes
 
 [Docker containers](https://www.docker.com/resources/what-container)
 are a common way to build projects in an independent _filesystem_, and
@@ -310,14 +321,12 @@ $ sudo su
     same name as the original image that the container was created
     from! In this case, the old image will be over-written.
 
- 9. Show how to copy a file from the Docker container to the host
-    operating system.
-
- 10. Show how to copy a file from the host operating system into the
-     Docker image.
-
- 11. Show how to mount a local directory into the Docker image (to use
-     files of the host operating system inside the Docker container).
-
- 12. Make more complex `Dockerfile`s (to install all necessary
-     software for example).
+ 9. More advanced demonstration and explanation on usage of
+    `Dockerfiles` can be see in [the README file of
+    Maneage](https://gitlab.com/maneage/project#building-in-docker-containers). Maneage
+    (http://maneage.org, short for Managing data lineage) is a
+    pipeline system to reproducibly preserve the pipeline of your
+    science project in the long term (with the ability to build within
+    containers for short-term moving of the project from one computer
+    to the next). A separate SMACK will be presented on Maneage in the
+    near future.