doc: add Technical intro doc

Add the "Introduction of Project Acorn" doc.

Also adds improvements to the doc generation processes, content styles,
removed doxygen-generated API material.

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

doc/glossary.rst

@@ -0,0 +1,114 @@
+:orphan:
+
+.. _glossary:
+
+Glossary of Terms
+#################
+
+.. glossary::
+   :sorted:
+
+   API
+      Application Program Interface: A defined set of routines and protocols for
+      building application software.
+
+   ACPI
+      Advanced Configuration and Power Interface
+
+   BIOS
+      Basic Input/Output System.
+
+   GPU
+      Graphics Processing Unit
+
+   I2C
+      Inter-Integrated Circuit
+
+   IC
+      Instrument Cluster
+
+   IVE
+      In-Vehicle Experience
+
+   IVI
+      In-vehicle Infotainment
+
+   OS
+      Operating System
+
+   OSPM
+      Operating System Power Management
+
+   PCI
+      Peripheral Component Interface.
+
+   PM
+      Power Management
+
+   Pass-Through Devices
+      Physical devices (typically PCI) exclusively assigned to a guest.  In
+      the Project ACRN architecture, pass-through devices are owned by the
+      foreground OS.
+
+   PV
+      Para-virtualization (See
+      https://en.wikipedia.org/wiki/Paravirtualization)
+
+   RSE
+      Rear Seat Entertainment
+
+   SDC
+      Software Defined Cockpit
+
+   SOS
+      Service OS
+
+   UEFI
+      Unified Extensible Firmare Interface. UEFI replaces the
+      traditional BIOS on PCs, while also providing BIOS emulation for
+      backward compatibility. UEFI can run in 32-bit or 64-bit mode and, more
+      important, support Secure Boot, checking the OS validity to ensure no
+      malware has tampered with the boot process.
+
+   UOS
+      User OS (also known as Guest OS)
+
+   VHM
+      Virtio and Hypervisor Service Module
+
+   VM
+      Virtual Machine
+
+   VMM
+      Virtual Machine Monitor
+
+   VMX
+      Virtual Machine Extension
+
+   Virtio-BE
+      Back-End, VirtIO framework provides front-end driver and back-end driver
+      for IO mediators, developer has habit of using Shorthand. So they say
+      Virtio-BE and Virtio-FE
+
+   Virtio-FE
+      Front-End, VirtIO framework provides front-end driver and back-end
+      driver for IO mediators, developer has  habit of using Shorthand. So
+      they say Virtio-BE and Virtio-FE
+
+   VT
+      Intel Virtualization Technology
+
+   VT-d
+      Virtualization Technology for Directed I/O
+
+   IDT
+      Interrupt Descriptor Table: a data structure used by the x86
+      architecture to implement an interrupt vector table. The IDT is used
+      to determine the correct response to interrupts and exceptions.
+
+   ISR
+      Interrupt Service Routine: Also known as an interrupt handler, an ISR
+      is a callback function whose execution is triggered by a hardware
+      interrupt (or software interrupt instructions) and is used to handle
+      high-priority conditions that require interrupting the current code
+      executing on the processor.