Rename all Silicon Labs starter kits to always use the official kit name
as board target name. Previous kit names used various naming schemes,
including putting part of the SoC name in the board name. With HWMv2,
SoC names (if needed) should go in the SoC board qualifier.
Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>
Introduce three subcategories for Silabs boards: dev_kits, radio_boards
and starter_kits. The dev_kits category contains small form-factor
standalone boards branded as "Dev Kit" or "Thunderboard". The
radio_boards category contains radio boards to be used with a wireless
mainboard, and the starter_kits category contains larger form-factor
standalone boards branded as "Starter Kit".
Structure the Sphinx documentation the same way as the directory tree.
Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>