docs(virtual-macchine_drivers): update bazel and Gitian links
Bitcoin recently moved to Guix, and this project is now archived. See https://gitian.org/ and https://github.com/devrandom/gitian-builder So I changed the text of the Bitcoin reference.
404 Bazel link: https://bazel.io/docs/be/docker.html
I am not 100% sure if this is the correct link, but didn't find another one https://bazel.build/install/docker-container
Edited by Jacoba Neighbourhood