Edit item button-listener and handler

[bermarte]

@perezrei It would be nice to use checkboxes and write what you have to do or maybe adding a short description. For example:

• [x] adding the HTML and the CSS for the button
• [ ] import the handler

[perezrei]

Ok @bermarte excellent tip thanks

[perezrei]

• [ ] add the listener
• [ ] create the handler function