DOC-13161 extract preview config (#335)

Author: osfameron

antora.yml

@@ -4,19 +4,3 @@ asciidoc:
   attributes:
     ui-name: Capella UI
     product-name: Capella
-ext:
-  preview:
-    HEAD:
-      sources:
-        docs-capella:
-          branches: [main]
-      override:
-        site:
-          startPage: cloud:get-started:intro.adoc
-    AV-68634-tutorial-feature-branch:
-      sources:
-        docs-capella:
-          branches: [AV-68634-dev-tutorial-navigation]
-      override:
-        site:
-          startPage: cloud:get-started:intro.adoc

preview/AV-68634-tutorial-feature-branch.yml

@@ -0,0 +1,6 @@
+sources:
+  docs-capella:
+    branches: [AV-68634-dev-tutorial-navigation]
+override:
+  site:
+    startPage: cloud:get-started:intro.adoc

preview/HEAD.yml

@@ -3,4 +3,4 @@ sources:
     branches: [8-0-docs-uptake]
 override:
   site:
-    startPage: cloud:get-started:intro.adoc
+    startPage: cloud:get-started:intro.adoc