Update git submodules

* Update docs/submodules/modeling/etsicatalog.git from branch 'master'
  to 6ffe1ecc8f0d52d7546ff640d275748ba21ff00c
  - Merge "Update css file name in conf.py"
  - Update css file name in conf.py
    
    ribbon.css is the correct name of the css file.
    
    Issue-ID: CIMAN-376
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: I59e32e868a7f2be2a1c2ac12116ffc75495efe34
    
1 file changed