Implement Site Teardown

[freeformflow]

I was so focused on building a site that H9 doesn't really do any sort of teardown for you. Add the ability to delete S3 buckets (which requires going through and deleting all objects first), CloudFront distributions (which take 15 minutes to disable first), and DNS records.

[dyoder]

Should we first switch to doing everything with CFo?

[freeformflow]

Even with mango, I did CFr and DNS without CFo templates. I just did it better, haha.

[dyoder]

Why not use templates?

[freeformflow]

I think I avoided it because the CFr distribution's configuration is so complex. But now that I've got a cleaner implementation in Mango, it would make sense to invoke that config assembler in the CFo template construction. I'll go ahead and move that to the top of my to-do list, because I'm still having intermittent issues with non-CFo teardown in Mango.

[dyoder]

Yay!