[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#8064

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

content/applications/general/iot.rst

@@ -0,0 +1,25 @@
+:nosearch:
+:show-content:
+:hide-page-toc:
+:show-toc:
+
+========================
+Internet of Things (IoT)
+========================
+
+.. toctree::
+   :titlesonly:
+
+   iot/config
+   iot/devices
+
+.. note::
+   The Open Platform Communications (OPC) Unified Architecture (UA) protocol is now supported by the
+   :abbr:`IoT (Internet of Things)` box. :abbr:`OPC (Open Platform Communications)` :abbr:`UA
+   (United Architecture)` is an open standard that specifies information exchange for industrial
+   communication on devices, between machines and between systems. This includes communication
+   between information technology and operational technology. :abbr:`OPC (Open Platform
+   Communications)` :abbr:`UA (United Architecture)` can be used with any software platform, on a
+   wide variety of devices, and deployed securely. The :abbr:`IoT (Internet of Things)` box has
+   entered the world of the Industry 4.0 standard and can be utilized in a wide variety of
+   industries, and for things like building automation, packaging, utilities, etc.