Delete old duckdb index files

assamese-assamese/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:de7a603e4e586d9fd0c127b5da0615053ea24886514eff44736e671bd5d530cc
-size 1585152

assamese-assamese/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:72ff98849095802778b6a96b2ab875ae52081fa0ad073f232d08158efa337705
-size 8400896

assamese-assamese/valid/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:e147dc3f3b89b6a77f8a2527a0d0d72ea52dfdb3dcc2c7e137e141bc3c6ea70b
-size 1585152