Added .md suffix in some links.

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

@@ -259,4 +259,4 @@ Each box therein represents a so called 'Kernel'.
 but similarly provide basic functionality for running your use cases,
 e.g. Python or R)
 
-You can also [create your own Kernels](./jupyterhub_custom_environments.md).
+You can also [create your own Kernels](jupyterhub_custom_environments.md).

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

@@ -57,7 +57,7 @@ to either use "Python virtualenv" or "conda environment".
 ## Python Virtualenv
 
 While we have a general description on
-[Python Virtual Environments](/software/python_virtual_environments/), here we have a more detailed
+[Python Virtual Environments](../software/python_virtual_environments.md), here we have a more detailed
 description on using them with JupyterHub:
 
 Depending on the CPU architecture that you are targeting, please choose a `modenv`:
@@ -161,7 +161,7 @@ Installed kernelspec my-kernel in .../.local/share/jupyter/kernels/my-kernel
 !!! warning
 
     Take care to select the appropriate standard environment (as mentioned above)
-    when [spawning a new session](./jupyterhub#start-a-session).
+    when [spawning a new session](jupyterhub.md#start-a-session).
 
 ## Conda Environment