doc: Split the User Guide into multiple files

The User Guide document has grown organically over time and
now covers a wide range of topics, making it difficult to
skim read and extract information from. Currently, it covers
these topics and maybe a couple more:

- Requirements (hardware, tools, libs)
- Checking out the repo
- Basic build instructions
- A comprehensive list of build flags
- FIP packaging
- Building specifically for Juno
- Firmware update images
- EL3 payloads
- Preloaded BL33 boot flow
- Running on FVPs
- Running on Juno

I have separated these out into a few groups that become new
documents. Broadly speaking, build instructions for the tools,
for TF-A generally, and for specific scenarios are separated.
Content relating to specific platforms (Juno and the FVPs are
Arm-specific platforms, essentially) has been moved into the
documentation that is specific to those platforms, under
docs/plat/arm.

Change-Id: Ica87c52d8cd4f577332be0b0738998ea3ba3bbec
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/docs/plat/arm/index.rst b/docs/plat/arm/index.rst
new file mode 100644
index 000000000..e26f75e56
--- /dev/null
+++ b/docs/plat/arm/index.rst
@@ -0,0 +1,19 @@
+Arm Development Platforms
+=========================
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Contents
+
+   juno/index
+   fvp/index
+   fvp-ve/index
+   arm-build-options
+
+This chapter holds documentation related to Arm's development platforms,
+including both software models (FVPs) and hardware development boards
+such as Juno.
+
+--------------
+
+*Copyright (c) 2019, Arm Limited. All rights reserved.*