Filesystem feature not working: add warning and hint

As discussed in Ilmenau, I added a warning to the beginning of the subsection describing the filesystem features.

doc.zih.tu-dresden.de/docs/jobs_and_resources/slurm.md

@@ -555,6 +555,14 @@ constraints, please refer to the [Slurm documentation](https://slurm.schedmd.com
 
 ### Filesystem Features
 
+!!! danger "Not functional at the moment"
+
+    The filesystem features are currently not functional after the shutdown of the Taurus system. We
+    are actively working on integrating this feature mimic in the new HPC clusters.
+
+    We decided to not temporally remove this documentation, although it is not functional at the
+    moment. Please understand it as kind of an announcement to an upcoming feature addition.
+
 If you need a local disk (i.e. `/tmp`) on a diskless cluster (e.g. [Barnard](barnard.md))
 use the feature `local_disk`.`