WP Job Manager - Alerts 3.2.0

* Fix: Only run has_shortcode if content is not null (#148)

* Fix: Fix my-alerts.php template HTML
* Fix: Make 'Add alert' link relative
* Fix: Fix redirection after actions on My alerts page

* Enhancement: Replace my alerts table with list of cards #78
* Enhancement: Add Job Alerts admin table #80
* Fix: Fix PHP 8.2 deprecations #81
* Fix: Fix translation text domain #74
* Fix: Use Job Type IDs instead of slugs