Replace large CSV files with demo versions (655MB -> 2MB)

data/raw/order_products__prior.csv

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:27b59dc9cf0d485f55e64e0bc9c5d6fb077ae167f8dfeab9246a03b5b0186359
-size 577550706
+oid sha256:8f2ba401ae815a346255bb55a90d5554079d0c7203959858f55c5fdcd7ac3b72
+size 14273

data/raw/orders.csv

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:92a60ced67ac33bd82271f66ff9675374f69482d17a0e1442ba42caa8b3bff89
-size 108968645
+oid sha256:204ff8f21f5614ef9412df7282d45d3c3a7fe337316d9fbb1564d588b610ff79
+size 2709