This repo is empty as I left GitHub when it was purchased by MS.
However, this readme provides below a link to the Redshift Observatory Replacement Systems Tables page, providing the SQL file installer and the PDF and HTML docs.
Currently, there are about 780 views, but they are organized; you'll ignore those which don't matter.
https://www.redshift-observatory.ch/replacement_system_tables/index.html
HTML docs for current release : https://www.redshift-observatory.ch/replacement_system_tables/files/rst_241129.html