feat: Add help flag support to enhanced crontab management script installation

crontab-backups/europa/archive/europa-crontab-pre-install-20250526_105807.backup

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+# Edit this file to introduce tasks to be run by cron.
+# 
+# Each task to run has to be defined through a single line
+# indicating with different fields when the task will be run
+# and what command to run for the task
+# 
+# To define the time you can provide concrete values for
+# minute (m), hour (h), day of month (dom), month (mon),
+# and day of week (dow) or use '*' in these fields (for 'any').
+# 
+# Notice that tasks will be started based on the cron's system
+# daemon's notion of time and timezones.
+# 
+# Output of the crontab jobs (including errors) is sent through
+# email to the user the crontab file belongs to (unless redirected).
+# 
+# For example, you can run a backup of all your user accounts
+# at 5 a.m every week with:
+# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
+# 
+# For more information see the manual pages of crontab(5) and cron(8)
+# 
+# m h  dom mon dow   command
+# 2023-06-11 I can't figure out how to get the nas to mount automagically so here is a band-aid
+# @reboot sleep 30 && mount -a
+#
+# move the files previously backed up at 0100
+0 1 * * * /home/acedanger/shell/move-backups.sh
+# daily Plex backup at 0415
+15 4 * * * /home/acedanger/shell/backup-plex.sh
+# daily validation at 0700
+0 7 * * * /home/acedanger/shell/validate-plex-backups.sh --fix
+# backup immich database
+0 5 * * 1 mv /mnt/share/media/immich/uploads/backups/immich-db-backup* /mnt/share/media/backups/immich
+# Generate detailed weekly report (Sundays at 0800)
+0 8 * * 0 /home/acedanger/shell/validate-plex-backups.sh --report
+# Backup created: Mon May 26 10:58:07 AM EDT 2025
+# Backup type: pre-install
+# System: europa
+# User: root
+# Full system info: Linux europa 6.1.0-33-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.133-1 (2025-04-10) x86_64 GNU/Linux