* Move from basic logging to more detailed logging with a log file.
* Improve error handling in several functions.
* Modify the way log messages are displayed.
- The Makefile now includes installation instructions for Debian/Ubuntu based systems.
- The README has been updated with more detailed descriptions of the script's purpose, how it works, and how to use it.
- The service file has been added to manage the remindme_caldav daemon on a systemd-based system.