Update duckdb index files

.gitattributes

@@ -661,3 +661,4 @@ default/wordpress/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/webapps.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/webmasters.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/unix/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/worldbuilding/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/worldbuilding/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0eb8d7599baae7f5eba5cfee324fade6f5bba3a7f00a690f1f44f4f8387a1bdf
+size 941633536