newer versions don't have /crond anymore, so we check if crond is there if so restart it.
if crond is not there we check for cron and restart cron if its present
fixes#515
* Corrected file path by removing /mnt
* Update 20-zerotier.sh
* Update README.md
* removed /mnt directory as evertyhing is done in /data
* Corrected URL
* Update remote_install.sh
* Auto check data dir
* fixed adguard installation
* More data fixes
* Fix dns common data path
* fixed haproxy readme
* [on-boot-script] Improve add-cron-jobs example script
* Add .sh extension for consistency
* Small improvements to documentation
* [on-boot-script] Improve add-root-ssh-key(s) example script
* Complete rewrite of script
* Rename from "add-root-ssh-key" to "add-root-ssh-keys"
