Add SSL support

Problem/Motivation

Some webservice calls require TLS/SSL to be active. It would be best to generate a cert that could be automatically created, so you can visit your local site with SSL active.

Proposed resolution

DDev uses a mkcert command to generate local certs, and has a helper program to install so that your browser trusts them.

Caddy webserver I think can automatically do this, as well.

Remaining tasks

Investigate using Caddy to auto-generate certs for dev sites, and create a script to help configure browsers to trust the generated certs.