Delete old duckdb index files

ratings/full/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:20e7b2090711a24830f302393a73b3c70cb40c4079f6f3aa8b46aff37144f6c8
-size 1323008

simplification/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:daa4baa36a37272a33082671bfbccfa28b5a78009aef1ac6bf596c979769cc03
-size 1323008

simplification/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:fb39b3e8c2813c71dfd5f60eb95395fd82ae538b40dd1f2f2f37f9c5ce4a3e27
-size 4206592