Add transport and destination info to manifest doc

Initially I was missing transport information on podman manifest add.
Especially the `containers-storage` transport which references the
local image store. Had a use case where this came in quite handy and it
is not stated anywhere else in the docs. Suppose it does not make sense
for podman pull & push.

I've only added containers-storage and docker transports for
manifest add since I know those work. Maybe others work too.

I then also added the destination section to manifest push as it is done
in podman push & pull. I've added all transports here, but I don't know
if all are supported. Please review.

Signed-off-by: Alexander Wellbrock <a.wellbrock@mailbox.org>

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