Update duckdb index files

.gitattributes

@@ -134,3 +134,4 @@ default/gadgets/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/GetMotivated/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/UpliftingNews/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/Documentaries/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/mildlyinteresting/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/mildlyinteresting/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7df698af89ab4f6777a946010e7dd78c8c0a314e01c39f24a8c7d0fbac65a595
+size 1130115072