define mdfiles/images in config/submodules/docs/

again: the "depend" variable must never be used for subprojects
that point to a subdirectory of the main project, because there's
no clean way of handling this in case of error conditions.

make it a submodule under config/submodules/. this is for the
documentation, including static site generator documentation,
and image files (photos).

as of this revision, there are now only those "depend" projects
defined in config/git/, where the destination directory of the
subject is not a subdirectory of the main project, so:

in a subsequest revision, i will mitigate an existing bug whereby
failure of the dependency project leaves the main one still
intact, breaking builds; this revision enables that to be done.

from now on, subproject-to-subdirectory-of-main-project will
be avoided in config/git/; config/submodules/ will be used.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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