IVGCVSW-5605 Doxygen: Add the TfLite Delegate to Doxygen docu

 * Moves TensorFlowLiteDelegateSupport.md to doxygen
 * Renames a few .dox files to represent the structure of the documentation
 * Adds sections for build and use guides
 * Integrates markdown guides for the delegate into doxygen

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: I68b7a29239be88c0617da9bdfce5323ebf26f5bc
diff --git a/docs/02_build_guides.dox b/docs/02_build_guides.dox
new file mode 100644
index 0000000..c7e6fcd
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+/// Copyright (c) 2021 ARM Limited and Contributors. All rights reserved.
+///
+/// SPDX-License-Identifier: MIT
+///
+
+namespace armnn
+{
+/**
+@page buildguides Build Guides
+@tableofcontents
+
+This page links all guides to build and/or install Arm NN tools. Some of these guides are not hosted in our
+repository and will lead you to guides on
+https://developer.arm.com/solutions/machine-learning-on-arm/developer-material/how-to-guides
+
+Arm NN is written using portable C++14 and the build system uses [CMake](https://cmake.org/), therefore it is possible
+to build for a wide variety of target platforms, from a wide variety of host environments.
+
+Arm NN is managed by a single CMake project. That allows you to build multiple tools at once by combining the CMake
+options from different build guides.
+
+## TfLite Delegate build guide
+@subpage md_delegate_BuildGuideNative
+
+**/
+}
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