Delete old duckdb index files

DocLayNet_2022.08_processed_on_2023.01/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a728e9fecec9ba98b294811e13ca913783bb84135f90bd311e9dcda16758cfcd
-size 175124480

DocLayNet_2022.08_processed_on_2023.01/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:aa963c1b7f16195bf2e6276f051b02c84573ff5df6aa4acb57d0f2b01b5c16df
-size 2548314112

DocLayNet_2022.08_processed_on_2023.01/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:00a8c71e69ec98a6fdc157560b5664dda54b3ae7300c5cfafc6a214a5bbb99f9
-size 233058304