Delete old duckdb index files

default/climate_fever/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:20ec96090e0a5966afaf1c9f7fbc3f9fd9d15f85fa6060474c9b2c5b52341ff5
-size 3420160

default/climatefeedback/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:94ffa8a9cca3a62ba387b5131bb8b633cf5df5e76c210bebfd85cb39a1158b08
-size 1060864

default/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:57f3780fb80a176fe57e29c39af1cd2a4246aa16e5cac3f816112f0b92829a32
-size 1323008

default/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:554676d6239687e73a1c4fb81a2751295435d08cb3d854e18f3892daeceeea8a
-size 3158016

default/valid/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:7feb36772cf3f76a7089d06bc688890975b50f1d196e9693fc98327d4aba4fb5
-size 1323008