Additional repository for greta when suggested in another package

Dears,

I am mainatainer of an R package that is partly based on greta - the package is called runMCMCnbtadjust. It is presently archived in the CRAN. I am in the process of submitting it back to CRAN but one of my last difficulties is that greta does not seem to be available in CRAN any longer. I therefore need to add in the DESCRIPTION file of my package an additional repository in a line such as: Additional_repositories: https://andrewzm.github.io/dggrids-repo/ (see: https://andrewzm.wordpress.com/2017/02/04/packages-in-non-standard-repositories-what-to-do-when-submitting-your-own-r-package-to-cran/). Is there such a place on your github website where I can find a src folder as in the example above? If not, do you know if I can just indicate: https://github.com/greta-dev/greta?

I thank you very much in advance.

Sincerely,

Frédéric