feat: add anti-spam measures to form submission

- Added honeypot field (hidden 'fax' input) to catch bots that fill all fields
- Implemented time-based validation to detect submissions that are too fast (minimum 2 seconds between first interaction and submit)

Author: Michael-Schaer

wordpress/wp-content/themes/les-verts/style.css

@@ -2,7 +2,7 @@
  * Theme Name: Les Verts
  * Description: Custom theme for the GREENS of Switzerland. Designed by superhuit.ch, built by gruene.ch on top of superhuit's stack.
  * Author: superhuit.ch & gruene.ch
-* Version: 0.42.2
+ * Version: 0.42.2
  * Requires PHP: 7.4
  * Requires at least: 5.0
  * Theme URI: https://github.com/grueneschweiz/2018.gruene.ch/