Delete old duckdb index files

corpus-jawiki-20230403-cirrus/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:229847ca1e675091518b8fb60ff9b75f9784d6480d70046786c5aeb4d4117175
-size 3547607040

corpus-jawiki-20230403-filtered-large/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:cdaab20f309324a7175eca2a1da84635cd875c5bc31444e04e43d4b1fa06f19a
-size 2065444864

corpus-jawiki-20230403/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:c5f45244d4f2a5130e27b6be0b3bd39051022aa64d2720b656234cf75d2099ed
-size 2496933888

paragraphs-jawiki-20230403/train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:84ea4c0a7260fec50aaac6c17533e99075c6fca9dbddba9fdf84bc3c959e9a3f
-size 2628005888

passages-c300-jawiki-20230403/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:006f4eb3c60b6bed654f57b718d1c9e4b50b63c882294886c34350a8d40357da
-size 2450010112

passages-c400-jawiki-20230403/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:b2fd94692c40352c82adf4634f8497d61db260c49589103d735a51f46772d7eb
-size 2448699392

passages-para-jawiki-20230403/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:9b8f9d2d87e8e2055979fdddec7e05d92373122443523a675191c63884e4efe4
-size 2237673472