Remove 3.3.x from Camel documentation (#414)

diff --git a/antora-playbook.yml b/antora-playbook.yml
index 4ec5bff..09e3e7c 100644
--- a/antora-playbook.yml
+++ b/antora-playbook.yml
@@ -31,17 +31,6 @@
         - docs/components
 
     - url: git@github.com:apache/camel.git
-      branches: camel-3.3.x
-      start_paths:
-        # eip
-        - core/camel-core-engine/src/main/docs
-        # languages
-        - core/camel-core-languages/src/main/docs
-        - core/camel-xml-jaxp/src/main/docs
-        # main components doc
-        - docs/components
-
-    - url: git@github.com:apache/camel.git
       branches: camel-2.x
       start_paths:
         # main components doc