doc: describe remote worker setup

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
15 jobs for RTD_remote_workers in 17 minutes and 5 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #91404
amd64
dispatcher-debian-10

00:02:54

passed #91406
amd64
dispatcher-debian-11

00:03:14

passed #91405
amd64
server-debian-10

00:03:23

passed #91407
amd64
server-debian-11

00:05:57

 
  Analyze
passed #91409
amd64
black

00:00:34

passed #91410
amd64
code_quality

00:00:22

passed #91411
amd64
coverage

00:06:17

58.84%
passed #91412
amd64
dockerfiles

00:00:19

passed #91414
amd64
pylint

00:02:57

passed #91408
amd64-dind
sast

00:03:09

passed #91413
amd64
schemas

00:00:32

 
  Build
passed #91416
amd64
debian/10

00:02:08

passed #91415
amd64
doc

00:01:38

passed #91417
amd64-dind
docker-amd64-dispatcher

00:04:25

passed #91418
amd64-dind
docker-amd64-server

00:04:50