Link on Babelfish documentation

[tsolakoua]

Related to https://github.com/src-d/devrel/issues/72

At the documentation at Further Reading This repo contains the project documentation, which you can also see properly rendered at https://doc.bblf.sh/. (see bottom of image below) when clicking here, it redirects at the same page. The contect of this webpage is the same as on the readme on Github which makes sense there, but doesn't make sense on the doc pages.