Remove references to the empty `halo2` crate from the README#809

Merged

daira merged 1 commit intozcash:mainfrom daira:remove-empty-halo2-crate-from-readme

Feb 6, 2024

+5-2

Commits on Feb 6, 2024

Remove references to the empty halo2 crate from the README, and link
daira
committed