Doc: Create the Kernel Primer.

Creates the Kernel Primer, removes overview modules that are no longer
needed and updates the master file to include the new part.

Change-Id: I6d7f53f019089d502e763ecc1789fb152c90c465
Signed-off-by: Rodrigo Caballero <rodrigo.caballero.abraham@intel.com>

doc/index.rst

@@ -13,7 +13,7 @@
    :maxdepth: 1
 
    quick_start/quick_start.rst
-   zephyr_kernel
+   kernel/kernel.rst
    zephyr_project
 
 

doc/kernel/kernel.rst

@@ -1,17 +1,26 @@
-Zephyr Kernel Objects
-######################
+.. _zephyr_kernel:
 
-Use this information to understand how the different kernel objects of
-the Zephyr Kernel function. The purpose of this section is to help you
-understand the most important object of the operating system. In order
-to help you navigate through the content, we have divided the objects
-in :ref:`basicObjects`, :ref:`nanokernelObjects` and
-:ref:`microkernelObjects` objects.
+The Zephyr Kernel
+#################
 
-We strongly recommend that you start with the :ref:`basicObjects` before
-moving on to the :ref:`nanokernelObjects` or the
-:ref:`microkernelObjects`. Additionally, we have included some
-:ref:`driverExamples` for better comprehension of the objects' function.
+The purpose of this section is to help you understand the operation of the kernel and its features.
+This section also provides detailed information regarding the microkernel and the nanokernel
+services. Finally, you can find the information regarding the kernel's drivers and networking
+capabilities.
+
+This section does not replace the Application Program Interface
+documentation, rather, it offers additional information. The examples should provide
+you with enough insight to understand the functionality of the services but are not
+meant to replace the detailed in-code documentation.
+
+.. toctree::
+   :maxdepth: 2
+
+   overview/overview.rst
+   microkernel/microkernel.rst
+   nanokernel/nanokernel.rst
+   drivers/drivers.rst
+   networking/networking.rst
 
 .. rubric:: Abbreviations
 
@@ -27,11 +36,4 @@ moving on to the :ref:`nanokernelObjects` or the
 | IDT           | Interrupt Descriptor Table                                        |
 +---------------+-------------------------------------------------------------------+
 | XIP           | eXecute In Place                                                  |
-+---------------+-------------------------------------------------------------------+
-
-.. toctree::
-   :maxdepth: 2
-
-   contexts.rst
-   microkernel.rst
-   nanokernel.rst
++---------------+-------------------------------------------------------------------+

doc/object/contexts.rst

@@ -1,26 +0,0 @@
-.. _basicObjects:
-
-Execution Contexts
-##################
-
-Tasks, fibers and interrupt service routines serve as the basis of the
-operating system functionality. The purpose of this section is to
-describe how this execution contexts operate, their behavior and their
-implementation. Using this information you should be able to understand
-what each context is capable of, how it operates and where its limits
-are.
-
-This section does not replace the Application Program Interface
-documentation but rather complements it. The examples should provide
-you with enough insight to understand the functionality but are not
-meant to replace the detailed in-code documentation.
-
-
-
-.. toctree::
-   :maxdepth: 2
-
-
-   fibers.rst
-   interrupts.rst
-   tasks.rst

doc/zephyr_kernel.rst

@@ -1,16 +0,0 @@
-.. _zephyr_kernel:
-
-The Zephyr Kernel
-#################
-
-This section contains the information about the kernel's code.
-
-.. toctree::
-   :maxdepth: 2
-
-   architecture/architecture.rst
-   object/object.rst
-   net/network.rst
-   platform/platform.rst
-   doxygen/doxygen_output.rst
-   development/development.rst