Update tox.ini && conf.py file

Performed-by: gitea/infra/otc-metadata/tools/generate_doc_confpy.py

doc/requirements.txt

@@ -1,4 +1,12 @@
 sphinx>=2.0.0,!=2.1.0 # BSD
+
 otcdocstheme # Apache-2.0
+
 # releasenotes
 reno>=3.1.0 # Apache-2.0
+
+otc-sphinx-directives>=0.1.0
+sphinx-minify>=0.0.1 # Apache-2.0
+git+https://gitea.eco.tsi-dev.otc-service.com/infra/otc-metadata-swiss.git#egg=otc_metadata
+setuptools
+gitpython

zuul.yaml

@@ -1,11 +1,14 @@
+---
 - project:
     merge-mode: squash-merge
     default-branch: main
     templates:
       - helpcenter-swiss-base-jobs
+    vars:
+      sphinx_pdf_files:
     check:
       jobs:
         - noop
     gate:
       jobs:
-        - noop
+        - noop