* add a js validator that makes smtp server port required
* specifying that the InputField should be a number. this doesn't work, but i think that it should.
* casting the port as an int as a stop-gap fix
* email doesn't already have to be enabled to be enabled
* don't return the smtp password from the API
* show a fake placeholder password if the username is also set
* error type for @groob
* AppSettingsPage at /admin/settings
* Adds App Settings to site nav items
* SMTP not configured warning
* Creates AppConfigForm
* Avatar preview
* API client to update app config
* Creates OrgLogoIcon component
* Hide username/password when no auth type
