edit entries for ice bathing/breathing

[PacoSchwab]

Value proposition

As a user I want to be able to edit ice bathing/breathing sessions So that I can modify my entries

Description

Acceptance criteria

• [x] the existing form is extended with an edit button
• [x] the user can edit an entry

Tasks

• [x] add edit button

[toshydev]

Editing and Deleting could be separate User Stories. They're complex enough in themselves.