[doc mv] `doc/{s*,c*}` files moved for new layout.

No file has been modified, so that git can more easily track moved files.

Signed-off-by: Hugo McNally <hugo.mcnally@gmail.com>
Co-authored-by: Harry Callahan <hcallahan@lowrisc.org>
Co-authored-by: James Wainwright <james.wainwright@lowrisc.org>
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