User can delete an entry

[Yang-Darren]

💰 Motivation

If a user decides that they no longer wish to keep an entry, they should be able to delete it.

📐 Plan

Allow users to delete an entry from its edit screen.

🖼️ Wireframes

✅ Task List

• Add a click target for deleting an entry to the entry form that only appears if the user is editing an entry.
• Show a confirmation modal when the user clicks the Delete Entry click target.
• Hide the modal if the user clicks Cancel.
• Remove the entry from the data model and the entry's DOM tree from the page if the user clicks Delete.
• Show the Entries list if the user clicks Delete.
• Remove all CSS styling that had no affect or was otherwise unnecessary.
• Test all functionality again in a private browsing session.
• Fix all errors.