Add warning on end of life

doc.zih.tu-dresden.de/docs/data_lifecycle/warm_archive.md

 # Warm Archive
 
+!!! danger "Warm Archive is End of Life"
+
+    The `warm_archive` storage system will be decommissioned for good together with the Taurus
+    system (end of 2023). Thus, please **do not use** `warm_archive` any longer and **migrate you
+    data from** `warm_archive` to the new filesystems. We provide a quite comprehensive
+    documentation on the
+    [data migration process to the new filesystems](jobs_and_resources/barnard/#data-migration-to-new-filesystems).
+
+    You should consider the new `walrus` storage as an substitue for jobs with moderately low
+    bandwidth, low IOPS.
+
 The warm archive is intended as a storage space for the duration of a running HPC project.
 It does **not** substitute a long-term archive, though.
 

[Noah Löwer]

walrus ist momentan read-only auf barnard. Wir sollten die genaue Intention hinter diesem filesystem von Ulf/HPC Team erfragen.