Replaced html video tags with mkdocs-video plugin

doc.zih.tu-dresden.de/docs/access/jupyterhub_teaching_example.md

@@ -160,12 +160,8 @@ The following video shows an example of the process of opening the
 spawn link and activating the environment, from the students perspective.
 Note that this video shows the case for a conda virtual environment.
 
-<div align="center">
-<video width="446" height="240" controls muted>
-  <source src="../misc/startup_hub.webm" type="video/webm">
-Your browser does not support the video tag.
-</video>
-</div>
+![type:video](misc/startup_hub.webm)
+
 
 !!! note
     - The spawn link may not work the first time a user logs in.

doc.zih.tu-dresden.de/docs/software/virtual_desktops.md

@@ -20,16 +20,7 @@ Use WebVNC or DCV to run GUI applications on HPC resources.
 
 ### Demonstration
 
-<video controls="" width="320" style="border: 1px solid black">
-<source src="https://doc.zih.tu-dresden.de/software/misc/start-virtual-desktop-dcv.mp4"
-        type="video/mp4" />
-<source src="https://doc.zih.tu-dresden.de/software/misc/start-virtual-desktop-dcv.webm"
-        type="video/webm" />
-</video>
-
-<!--Hier steht ein Video.-->
-<!--In der mkdocs.yaml muss aber noch das Plugin mkdocs-video eingetragen werden-->
-<!--![type:video](misc/start-virtual-desktop-dcv.mp4)-->
+![type:video](misc/start-virtual-desktop-dcv.mp4)
 
 ### Using the Quickstart Feature
 
@@ -66,12 +57,7 @@ find your WebVNC desktop the way you left it.
 
 ### Demonstration
 
-<video controls="" width="320" style="border: 1px solid black">
-<source src="https://doc.zih.tu-dresden.de/software/misc/terminate-virtual-desktop-dcv.mp4"
-        type="video/mp4" />
-<source src="https://doc.zih.tu-dresden.de/software/misc/terminate-virtual-desktop-dcv.webm"
-        type="video/webm" />
-</video>
+![type:video](misc/terminate-virtual-desktop-dcv.mp4)
 
 !!! note