[MOV] general: moving VoIP docs from "CRM" to "general"

- 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

crm/optimize.rst

@@ -6,7 +6,5 @@ Optimize your Day-to-Day work
    :titlesonly:
 
    optimize/google_calendar_credentials
-   optimize/onsip
-   optimize/setup
    optimize/partner_autocomplete
    optimize/gamification

general.rst

@@ -14,5 +14,6 @@ General
    general/auth
    general/tags
    general/payment_acquirers
+   general/voip
    general/in_app_purchase
    general/developer_mode

general/voip.rst

@@ -0,0 +1,10 @@
+===================================
+VoIP (Voice over Internet Protocol)
+===================================
+
+.. toctree::
+   :titlesonly:
+
+   voip/asterisk
+   voip/onsip
+   voip/asterisk

redirects.txt

@@ -172,3 +172,6 @@ discuss/email_servers.rst discuss/advanced/email_servers.rst               # (#6
 discuss/plan_activities.rst discuss/overview/plan_activities.rst           # (#655)
 discuss/team_communication.rst discuss/overview/team_communication.rst     # (#655)
 discuss/overview.rst discuss/overview/get_started.rst                      # (#655)
+
+crm/optimize/onsip.rst general/voip/onsip.rst                                                       # crm/optimize/* --> general/voip/*
+crm/optimize/setup.rst general/voip/asterisk.rst                                                    # crm/optimize/setup --> general/voip/asterisk