Enable incremental builds.

Author: Stephen Tramer

.openpublishing.publish.config.json

@@ -36,7 +36,7 @@
   "git_repository_branch_open_to_public_contributors": "master",
   "skip_source_output_uploading": false,
   "need_preview_pull_request": true,
-  "enable_incremental_build": false,
+  "enable_incremental_build": true,
   "contribution_branch_mappings": {},
   "dependent_repositories": [
     {
@@ -90,4 +90,4 @@
     "mapping/monikerMapping.json"
   ],
   "dest": "_site"
-}
+}