Can't remove email

# Feature Request

## Description / Use Case

When my account has multiple emails, and one of them was not used anymore, I want to remove it from the list.
The current UI does not have any remove email feature. It comes with only select email.

Security purpose: In case someone claim a domain and use the same email address for posting comment, it will display the avatar of old owner which is wrong.

## Proposed Solution

Please implement the remove email feature.

The issue does not name any files or tests. Start by locating the account UI that lists selectable email addresses, then trace how email selection affects the displayed avatar. Done means users can remove an unused email and it no longer appears in the list or supplies an avatar association.

Written by the indexing model from the issue text.