Add magnetic-materials-ontology tab

[andrea-petrocchi]

No description provided.

[samjrholt]

I think this is good for now but in the future we should consider importing this from the other repository to make sure we always have the most up to date version

[lang-m]

Do we really need another full copy of this page? A link to https://emmo-repo.github.io/domain-magnetic-materials/magnetic-materials.html on the landing page of mammos-project.github.io might be better. We could e.g. insert a new section Domain ontology magnetic materials before the Additional tools section. We should then describe the ontology in a few sentences and link to its webpage (link above) as well as the repository where the development takes place.