2.7. As a talent, I want to be able to delete my own Proofs

[asya982]

Acceptance criteria

7.1 Ask the talent if he confirms the deletion of the proof
7.2 Confirmation message about deleting an proof
7.3 Prohibit the ability to delete proofs of other talents

Tasks

Front-end

• 2.7.1. Add delete button frontend#82

Back-end

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