If I remember correctly, they used to be in a tab in the top navigation, together with "Code", "Issues", "Pull requests", etc. which was a lot easier to find for people who are not familiar with GitHub's UI. Edit: it was a separate bar right above the file list, together with the number of commits and branches: https://web.archive.org/web/20180610234228/https://github.com/rails/rails

Same problem with forks / network. In earlier revisions of GitHub's UI, they were relatively easy to find. Now you have to know that you can click the "59.7k forks" sidebar text which is in no way styled like a link or button. You can just infer it from the fact that there are also "Readme" and "View license" in the same list.