Update virtualization/containers README.md

closes #236

Author: MakisH

02_virtualization_and_containers/README.md

@@ -9,11 +9,8 @@ Learning goals:
 
 | Duration | Content |
 | --- | --- |
-| 10 minutes | [`containers_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/containers_slides.md), [`containers_demo.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/containers_demo.md) |
-| 65 minutes | [`docker_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/docker_slides.md), [`docker_demo.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/docker_demo.md) |
-| 5 minutes | [`intro_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/intro_slides.md) |
-| 20 minutes | [`singularity_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/singularity_slides.md), [`singularity_demo.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/singularity_demo.md) |
-| 30 minutes | [`vagrant_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/vagrant_slides.md), [`vagrant_demo.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/vagrant_demo.md) |
-| 40 minutes | [`virtualbox_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/virtualbox_slides.md), [`virtualbox_demo.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/virtualbox_demo.md) |
-| 5 minutes | [`virtualmachines_slides.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/virtualmachines_slides.md) |
-| 90 minutes | [`virtualmachines_containers_exercise.md`](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/virtualmachines_containers_exercise.md) |
+| 5 minutes | [Virtualization and Containers](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/intro_slides.md) |
+| 15 minutes | [Virtualbox](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/virtualbox_slides.md), [demo](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/virtualbox_demo.md) |
+| 20 minutes | [Vagrant](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/vagrant_slides.md), [demo](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/vagrant_demo.md) |
+| 30 minutes | [Docker](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/docker_slides.md), [demo](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/docker_demo.md) |
+| 20 minutes | [Singularity / Apptainer](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/singularity_slides.md), [demo](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/02_virtualization_and_containers/singularity_demo.md) |