Remove docs submodules

This is the final change in the docs migration
topic CIMAN-376.
We have switched projects to use intersphinx
linking and away from submodules.

Issue-ID: CIMAN-376
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: I4e7446a677e1847cee139f41c91b7734d148cdb4
74 files changed