antora-playbook: Remove eForms SDK docs for version 1.11 and earlier

Notices with those version are not accepted for publication any more, so
the docs are not needed.

Author: bertrand-lorentz

antora-playbook.yml

@@ -50,7 +50,7 @@ content:
   ### eForms SDK
   - url: https://github.com/OP-TED/eforms-docs.git
     start_path: /
-    branches: 1.14.x, 1.13.x, 1.13.x-generated, 1.12.x, 1.12.x-generated, 1.11.x, 1.11.x-generated, 1.10.x, 1.10.x-generated, 1.9.x, 1.9.x-generated, 1.8.x, 1.8.x-generated, 1.7.x, 1.7.x-generated, 1.6.x, 1.6.x-generated, main # The "main" branch contains the eForms FAQ and RoadMap
+    branches: 1.14.x, 1.13.x, 1.13.x-generated, 1.12.x, 1.12.x-generated, main # The "main" branch contains the eForms FAQ and RoadMap
 
   ### ePO Documentation
   - url: https://github.com/OP-TED/epo-docs.git