feat(Nextcloud): install bash completion for ncc

nextcloud-installer.sh

@@ -257,6 +257,11 @@ function install_ncc
 exec php /var/www/virtual/\$USER/html/occ "\$@"
 end_of_content
   chmod u+x ~/bin/ncc
+
+  ncc _completion --generate-hook --program=ncc > ~/_nextcloud_completion
+  echo "source \$HOME/_nextcloud_completion" >> ~/.bash_profile
+  # shellcheck source=/dev/null
+  source ~/.bash_profile
 }
 
 function install_nextcloud_updater