How to install Nginx Proxy Manager on a Synology NAS (Custom Domains!)

A little tutorial on how to install Nginx Proxy Manager on a Synology NAS. Very simple. It's really 8 minutes of tutorial and then 10 minutes of me rambling about how I'm not going to explain how to set up the reverse proxy part, sort of explaining it, and then rambling on about Docker networks or something.
Check out networking 101-103 if you want to know more about networks and how reverse proxies work and how connecting custom domains to your NAS would work.