dev-manual: Add info on build env initialization

Going through the docs we a new trainee, we noticed that the build
initialization is only mentioned in the quick build
(https://docs.yoctoproject.org/brief-yoctoprojectqs/index.html) but not
in the in-depth getting started documentation.

While this is repeatedly mentioned later on, e.g. in the "building" section,
you might easily end up somewhere where this has not been mentioned yet.

E.g. in our case this was:

https://docs.yoctoproject.org/dev-manual/layers.html# (which comes right
after the "setup" chapter)
->
https://docs.yoctoproject.org/dev-manual/layers.html#creating-a-general-layer-using-the-bitbake-layers-script
(which is linked right at the top)

To avoid any confusion I think it best to mention this required step
directly in the "start" document.

(From yocto-docs rev: d7a36b7b8e770ae45b991698d588f9522ba59b4e)

Signed-off-by: Jasper Orschulko <jasper@fancydomain.eu>
Reviewed-by: Michael Opdenacker <michael@opdenacker.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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