Documentation: Synchronise camera stack details

There are two near-duplicate instances of the camera stack details
in the Documentation, in docs.rst and guides/introduction.rst. Remove
them from guides/introduction.rst, with the exception of the
explanations of the V4L2 Compatibility Layer and the Android HAL
which are moved to the Camera Stack section in docs.rst. The Docs
page already had its own separate version of those details but they
are distinct and seemingly out of date - remove them.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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