add docs-server to chatbot sources

Author: osfameron

antora-playbook-staging-chatbot.diff.yml

@@ -59,6 +59,10 @@ content:
     branches:
       $replace: [master]
 
+  - url: https://github.com/couchbase/docs-server
+    branches:
+      - release/8.0
+
   - url: https://github.com/couchbase/docs-sdk-common
     # not $replace, as we can just merge
     branches: 

antora-playbook-staging-chatbot.yml

@@ -204,6 +204,7 @@ content:
       start_path: docs
     - url: https://github.com/couchbase/docs-server
       branches:
+        - release/8.0
         - release/7.6
         - release/7.2
         - release/7.1