This commit creates a new template user_notification_settings.hbs
for user notification settings and notification_settings.hbs will
be used as a common template for user-level and realm-level
settings.
This commit creates a new template user_display_settings.hbs
for user display settings and display_settings.hbs will be
used as a common template for user-level and realm-level
settings.
We separate "Your account" section to two different sections -
"Profile" section for user name, custom profile fields, and avatar
and "Account & Security" section for email, password, role, api-key
and deactivating button.
Another important change here is that the modal for changing name
is removed and now the name has a simple input text box and it
behaves similar to inputs for custom-profile-fields.
Fixes#18848.