Add support to delete bucket

[logicminds]

I am using your tool in a CI environment where I create/deploy preview apps. Since these apps don't last that long I need to delete them very often. Would be great to have an option to remove the site as well.

[nick-benoit14]

@logicminds I think that would be a great option. I would happily accept a PR for that. Would you just imagine it being added to the API? Or also to support that in the json file?