Documentation: Remove libcamera architecture from introduction.rst

The libcamera Architecture section of the introduction is largely a
duplicate of the section broken out from docs.rst. Remove it from the
introduction.rst file and consolidate anything that wasn't duplicated
into libcamera_architecture.rst and feature_requirements.rst. Take the
opportunity to also expand the list of Platform Support which is now a
bit out of date.

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

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