Link to the relevant sections in the Zephyr documentation, including
application development and west topologies.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
-s/--source is a legacy option. There's a proposal to actually use it
for something else in Zephyr now:
https://github.com/zephyrproject-rtos/zephyr/pull/40669
Let's update README.
Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
