Remove: Deduction Type of Messages on the WhatsApp Business Platform

[KrishnaDwibhashi2]

Remove Deduction Type of Messages on the WhatsApp Business Platform page as it is not relevant today. Will add details in another document

https://glific.github.io/docs/docs/FAQ/Deduction%20Type%20of%20Messages%20on%20the%20WhatsApp%20Business%20Platform