remove clamav.yml from tree list

Author: christophdb

docs/installation/basic-setup.md

@@ -62,7 +62,6 @@ The expected output should appear as follows.
 # this should be the output of the tree command
 /opt/seatable-compose
 ├── caddy.yml
-├── clamav.yml
 ├── collabora.yml
 ├── .env
 ├── .env-release