Add more settings pages, help tip links, etc.

include/ajax.tips.php

include/class.config.php

include/i18n/en_US/help/tips/settings.alerts.yaml

include/i18n/en_US/help/tips/settings.autoresponder.yaml

include/i18n/en_US/help/tips/settings.email.yaml

include/i18n/en_US/help/tips/settings.system.yaml

include/staff/settings-alerts.inc.php

include/staff/settings-autoresp.inc.php

include/staff/settings-emails.inc.php

include/staff/settings-system.inc.php

scp/css/scp.css

scp/js/tips.js

scp/templates.php