Renamed config-overview to userguide

Change-Id: Ie8e4806686a251ee45e11a8b0447edd6a7407168
Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>

diff --git a/docs/userguide/config-overview.rst b/docs/userguide/userguide.rst
similarity index 100%
rename from docs/userguide/config-overview.rst
rename to docs/userguide/userguide.rst