* Changes to the site settings danger zone

The idea was to:

1. Show a transfer site ownership message to owners of the site only. This will make ownership transfer feature more discoverable. Will also help people to transfer ownership of a site rather than deleting the whole thing when that makes more sense
2. Add a note that site deletion is a delayed operation
3. Make some other tiny copy changes

What did I break? :)

* Fix markup so the long text wraps sooner

* Fix indent

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Co-authored-by: Adam Rutkowski <hq@mtod.org>