deluser, userdel: add page (#5245)

pages/linux/deluser.md

@@ -0,0 +1,21 @@
+# deluser
+
+> Delete a user from the system.
+> Note: all commands must be executed as root.
+> More information: <https://manpages.debian.org/adduser/deluser.8.html>.
+
+- Remove a user:
+
+`deluser {{username}}`
+
+- Remove a user and their home directory:
+
+`deluser --remove-home {{username}}`
+
+- Remove a user and their home, but backup their files into a `.tar.gz` file in the specified directory:
+
+`deluser --backup-to {{path/to/backup_directory}} --remove-home {{username}}`
+
+- Remove a user, and all files owned by them:
+
+`deluser --remove-all-files {{username}}`