Description
Hi, thanks for developing C2!
I noticed that the public website's SSL certificate is invalid, so only http:// is available on the public domain. If your hosting provider doesn't provide proper SSL encryption (for free), which also happened to my organization recently, I would recommend setting up a free CloudFlare domain proxy, which allows you to have http between your server and Cloudflare, while the connection between Cloudflare and the visitor goes through https. This at least provides a secure look in the person's browser and doesn't cause any troubles if they are visiting the site from a public place.
More info: https://developers.cloudflare.com/ssl/origin-configuration/ssl-modes/
(most likely the flexible encryption mode is suitable)
Let me know if you want to proceed with this, I might be able to help. It doesn't take too much effort but can be a bit of a puzzle when getting started.