Hello! I am submitting this at the suggestion of Whitney. I had deleted a load balancer that SSL configured, and was confused as to why the cert wasn't cleaned up too.
Whitney helped me locate where SSL management was under Security. While in hindsight I completely agree this is the correct place for it, I was certain there would be the ability to manage them or at least a link to manage them within the Manage > Networking section. My suggestion is to add a link titled "Manage SSL Certificates" on the Networking page, possibly on the Domain pages as well, that takes you to the Security page with the SSL cert management features.
It's a small suggestion, but I think it will palpably improve the UX of SSL management.
Digital Ocean is the best, bar none! Thank you for everything!