GoUsers: remove iLighten as it's website is down

Change-Id: I538a7fa537d41e4588e82e96e9dedfc6af13c5e3
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/643596
Auto-Submit: Ian Lance Taylor <[email protected]>
Commit-Queue: Ian Lance Taylor <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: alexandear

GoUsers.md

@@ -1350,7 +1350,6 @@ Certificate Expiry Monitor Controller monitors the expiration of TLS certificate
   * [Agilites](https://agilites.com)
   * [Aura](https://aura.com)
   * [ElifTech](http://www.eliftech.com)
-  * [iLighten](https://ilighten.com/)
   * [QArea](https://qarea.com/)
   * [Diligences](https://diligences.com/)
   * [ElementalsWeb](https://www.elementalsweb.com/)