This commit adds a dedicated page for the Zephyr SDK under the
'Toolchains' sub-category under 'Developing with Zephyr'.
The content of this page is based on the Zephyr SDK installation
instruction from the 'Getting Started Guide'.
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit adds individual documentation page for each toolchain type
based on the content from the `3rd_party_x_compilers.rst` file in order
to improve visibility.
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
