Capitalise industry labels, drop LinkedIn and sparse social columns

Link the email authentication dataset

Declare explicit column types so sparse columns stop breaking parquet conversion

Add all-adopters config, untruncate comparison group, shorten title, add access section

Add commercial CA comparison group (7,138 organizations)

Clarify that rows are ordered by website popularity rank

Add August 2026 collection date

Correct scope: 5,000 large companies and organizations, not a top-5,000 ranking

Remove duplicate xlsx, simplify card wording

Add citation and source link, correct field documentation, declare CC BY 4.0

Update README.md

Update README.md

initial commit