remove prepareinstall, it is a no longer relevant tool

docs/aims2/aims2prepare.md

-# aims2prepare
-
-TODO: This section has not been reviewed so it is still located under <https://twiki.cern.ch/twiki/bin/view/LinuxSupport/Aims2prepare>.
-
-**Not sure yet if still relevant.**
\ No newline at end of file

mkdocs.yml

@@ -61,7 +61,6 @@ nav:
         - 'AIMS2 server': aims2/aims2server.md
         - 'AIMS2 client': aims2/aims2client.md
         - 'AIMS2 how to': aims2/aims2how2.md
-        - 'AIMS2 prepare': aims2/aims2prepare.md
         - 'Troubleshooting': aims2/troubleshooting.md
         - 'Error compilation': aims2/errorcollection.md
     - 'Community':