The `Product` namespace segment in the domain model namespace
`TTN\Tea\Domain\Model` currently serves no purpose and only adds
confusion. So let's simplify the extension structure accordingly.
(I intended to use this to demonstrate DDD contexts, but never
built enough models in the Tea extension for this to actually
make sense.)
Fixes#1008
The delete action is triggered using a form with a submit button,
causing a POST request to be sent instead of a GET request.
This is because GET requests should not modify (or delete) data,
but only read it and be idempotent. Also, the request then
is guaranteed to not get cached.
From a usability perspective, a button instead of a link also
is semantically more correct: A link is expected to bring you
to some place, whereas a button is expected to trigger some
action.
Closes#871
