Added global attribute values

Author: ddieruf

antora.yml

@@ -5,11 +5,15 @@ start_page: index.adoc
 
 asciidoc:
   attributes:
+    allow-uri-read: '' # this has no effect in antora, but does help development in Intellij
     product_name: 'Astra Streaming'
     pulsar_version: '2.10' #DO NOT INCLUDE PATCH VERSION <MAJOR>.<MINOR>.<PATCH>
     debezium_version: '1.7'
     request_feature_access_email: '[email protected]'
     astra_ui: 'Astra Portal'
+    astra-streaming-examples-repo: 'https://raw.githubusercontent.com/datastax/astra-streaming-examples/using-s4k-guide'
+    external-link-icon: '&#x2197;'
+    luna-streaming-examples-repo: 'https://raw.githubusercontent.com/datastaxdevs/luna-streaming-examples/main'
 
 nav:
 - modules/pulsar-io/nav.adoc