Add alt text for user avatars Ex.: Momin's avatar

[MominRaza]

Lighthouse Report:-
Links do not have a discernible name
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users.

question2answer/qa-include/app/users.php

Line 675 in 4344721

return sprintf('<a href="%s" class="qa-avatar-link">%s</a>', qa_path_html('user/' . $handle), $html);