Update Kaggle links to the new username (old URLs 404)

Link the full dataset: portal, price and buy link

chore(contact): brand address on dataengineered.io

docs: shopfront moved to dataengineered.io

Describe the Safety layer

Refresh interactions_sample.csv (safety-layer teaser)

Refresh suppdb_sample.csv (safety-layer teaser)

Point explorer link to combined Sample Explorers Space

Add free sample and dataset card

initial commit