self-signed certificate has expired

[djcater]

https://self-signed.badssl.com/

I see that the auto-generating part was removed, but I think the static in-repo certificate should be regenerated as per: "we'll just track the expiration and regenerate in-tree when needed" from #390 (comment)_

[christhompson]

Ahh, same bug as in #417 -- thanks for catching these. I've made a note to myself in my deploy playbook and updated this one as well. This should be fixed on the site and #419 will make it so I don't accidentally pull in the expired one from the repo again.