Removed openretriever off submodules

Change-Id: Iea4f3f579e837bc4ff199a65b717be28113de2ef
Signed-off-by: ShubhamRathi <shubhamiiitbackup@gmail.com>
(cherry picked from commit 86879954e4c2636c5cf71d3539a1b2a356e66b68)

diff --git a/docs/submodules/openretriever b/docs/submodules/openretriever
deleted file mode 160000 (submodule)
index 14592c9..0000000
--- a/docs/submodules/openretriever
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 14592c93aa4dd318edd686394bd13a8880c2219b