Delete old duckdb index files

cnn-dm/test/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:30cd21fef90486b47280f77ab03baf0300c252067ea371d7b25fc0ff69de3893
-size 43266048

cnn-dm/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:bfed2ccb54397bd33ffea11ba51b5b1e11cb8060347dfea8e06424e83b75184b
-size 3158016

cnn-dm/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:71cec5c83c7247863b4c70ad10a63e9baad15dad34ecbf2129ae44c5d213fb16
-size 52703232

xsum-sampled/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:eec9cb98ea47fe8f1d140ac2fdec984dd409f2b519956b29844fb6f21a39aaf5
-size 29634560

xsum-sampled/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:f1141b11062eeb70e62aa38a09e47b454b692ca91def378aef16c5a403d5b85a
-size 1060864

xsum-sampled/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:87f701892cc5f212f993f5aabb016cb82b6651a3848f12726328f3014044d67e
-size 29372416

xsum/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:da484f98e21e57ad0fa14b6895ae7327d38f2ad615a3f6e7f3f1b3f52db9b64c
-size 29634560

xsum/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:85767a3dbf6fbc0b346d21ef9f0ac8689ec81b8bedba78fbcb8088077df34cff
-size 21245952

xsum/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:917716f1580cd7ae3e1147d6fdbfe5b615d13ea9ed4e3875645d4be1d3734005
-size 29634560