Boards: add iMX8MM with SE050

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@foundries.io>

README.md: add steps for building docs

Add steps needed for building documentation locally.

Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>

reference-manual: linux-wic-installer: add n1sdp support

Signed-off-by: Ricardo Salveti <ricardo@foundries.io>

linux: linux-layers: add instructions to customize the default BSP la…

…yers

Signed-off-by: Ricardo Salveti <ricardo@foundries.io>

se050: importing secure objects (foundriesio#139)

succintly inform of the secure object import design

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>

fix accidentally removed link

Signed-off-by: Matthew Croughan <matthew.croughan@foundries.io>

secure-element: introduction to the NXP SE050

Succinct documentation about the NXP SE050

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>

wireguard: Start some troubleshooting notes

Signed-off-by: Andy Doan <andy@foundries.io>

Add device testing reference

Signed-off-by: Andy Doan <andy@foundries.io>

factory-definition: Add notes on `ref_options`

Signed-off-by: Andy Doan <andy@foundries.io>