Hi Lukasz,
unfortunately, currently it is not going to be easy, I have not used this module for 8 months. A lot has changed since then.
1) The repo is
here. See the README file. There is a particular old branch of spack that I've made that makes the installation easy. However, it has not been updated in a long time.
2) Operators already pushed, it is a standalone module. Of course, ideally, we should move it to basic finite elements, or make it optional when installing MoFEM.
3) MFront is already integrated with spack ("spack install mgis"), we just have to specify python libraries appropriately, such that there are no conflicts with MoFEM.
4) Mgis was updated in the meantime, so possibly there might be some problems with the compilation. I used version 1.0, now we have 1.1.
I am happy to support anyone interested in continuing this project. I think we should start with spack, and make the command "spack install mofem-cephas+mgis" work with the newest version.