- moving VoIP docs from "CRM" to "general"
- renaming "setup.rst" as "asterisk.rst" which is more accurate
- redirections:
* crm/optimize/onsip --> general/voip/onsip
* crm/optimize/setup --> general/voip/asterisk
- Updates the main current doc about Payment Acquirers with a completely new doc
- Moves some docs from ecommerce to general
- redirects
- ecommerce/shopper_experience/payment --> general/payment_acquirers/payment_acquirers
- ecommerce/shopper_experience/authorize --> general/payment_acquirers/authorize
- ecommerce/shopper_experience/paypal --> general/payment_acquirers/paypal
- ecommerce/shopper_experience/wire_transfer --> general/payment_acquirers/wire_transfer
