[MOV] documentation structure reorganization

This commit aims to improve the documentation's navigability by
redefining some categories' purposes and titles.

There is a redirection rule for each documentation page moved.
This ensures that users won't have a 404 error message.

task-3217827

closes odoo/documentation#8061

Signed-off-by: Jonathan Castillo (jcs) <jcs@odoo.com>

content/applications/sales/point_of_sale/payment_methods/terminals/ingenico.rst

@@ -16,7 +16,8 @@ Connect an IoT Box
 
 Connecting an Ingenico Payment Terminal to Odoo is a feature that
 requires an IoT Box. For more information on how to connect an IoT Box
-to your database, please refer to the :doc:`IoT documentation </applications/productivity/iot/config/connect>`.
+to your database, please refer to the :doc:`IoT documentation
+</applications/general/iot/config/connect>`.
 
 Configure the Lane/5000 for Ingenico BENELUX
 --------------------------------------------

content/applications/sales/point_of_sale/payment_methods/terminals/six.rst

@@ -27,7 +27,7 @@ Connect an IoT box
 ------------------
 
 Connecting a Six payment terminal to Odoo is requires :doc:`using a Raspberry Pi or virtual (for
-Windows OS only) IoT box </applications/productivity/iot/config/connect>`.
+Windows OS only) IoT box </applications/general/iot/config/connect>`.
 
 Configure the terminal ID
 -------------------------

content/applications/sales/point_of_sale/payment_methods/terminals/worldline.rst

@@ -16,7 +16,7 @@ Connect an IoT Box
 
 Connecting a Worldline Payment Terminal to Odoo is a feature that requires an IoT Box. For more
 information on how to connect one to your database, please refer to the
-:doc:`IoT documentation </applications/productivity/iot/config/connect>`.
+:doc:`IoT documentation </applications/general/iot/config/connect>`.
 
 Configure the protocol
 ----------------------