I'm trying to find out a good way to secure Confluence with a free Let's Encrypt SSL (automated). This, in general, is usually pretty easy to setup. However, Confluence make it seem a lot harder than its supposed to be with the documentation and non-support. What are the steps to make this happen on a Ubuntu 18.04 server, Internal LAN w/ 1 DHCP external WAN, and with Cloudflare as my NS?