This commit removes unneeded OpenVPN related code and improves error handling in the alert system. All OpenVPN related functions and html files have been removed. Also, changes are made in the alerting module to raise exceptions instead of returning error messages, which provides a more pythonic way of error handling.
The JavaScript paths in many files have been updated to "/app/static/js". A new script for handling checker settings updates, "checker.js", has been added. The commit improves organisation of JavaScript resources by grouping them under a single directory and introduces new functionality for the checker service.