Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to c5d39edc6a5c3f980e9341f3ef0a09b7d28f98a1
  - Fix dev config designer user in catalog-ui

    The userId for the mocked user used in the catalog-ui
    development environment was incorrect.
    Small adjustments in the webpack.server.js file.
    Improves the README.md for better understanding of some
    configuration options.

    Change-Id: I231f4349a868a2544a6b1ab9e9deb68873850e2b
    Issue-ID: SDC-2779
    Signed-off-by: andre.schmid <andre.schmid@est.tech>

diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 99f16df..c5d39ed 160000 (submodule)
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 99f16df848dd16806e948327b73ef0dbaaaa0cce
+Subproject commit c5d39edc6a5c3f980e9341f3ef0a09b7d28f98a1