Update tox.ini && conf.py file

Reviewed-by: tischrei <tino.schreiber@t-systems.com>
Co-authored-by: Sebastian Gode <sebastian.gode@telekom.de>
Co-committed-by: Sebastian Gode <sebastian.gode@telekom.de>

zuul.yaml

@@ -1,3 +1,4 @@
+---
 - project:
     merge-mode: squash-merge
     default-branch: main
@@ -5,11 +6,11 @@
       - helpcenter-base-jobs
     vars:
       sphinx_pdf_files:
-        - deh-api-ref.pdf
-        - deh-umn.pdf
+        - ccn-umn.pdf
+        - ccn-api-ref.pdf
     check:
       jobs:
         - noop
     gate:
       jobs:
-        - noop
+        - noop