When creating a new tea record in the FE, or when editing one,
the tea model provided to the form is not necessarily valid
(and we need to accept invalid models if the following action
rejects the model due to a valiation error).
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
