Most a note-to-self to implement this, but if someone wants to open a PR before I do, by all means.

In the past, we used Go's stdlib flags which meant it was not possible to support caddy -v. But we've since switched to Cobra, so it's now possible to do so.

For context, some users were complaining about this on social media:

• https://frfsh.plus.st/notes/9hxugdnvdqnjgnm7
• https://mstdn.social/@mattwilcox/111201843985131969