change structure, bad links

docs.it4i/anselm/software/nvidia-cuda.md

docs.it4i/software/chemistry/nwchem.md

docs.it4i/software/chemistry/orca.md

docs.it4i/software/chemistry/phono3py.md

docs.it4i/software/comsol/comsol-multiphysics.md

....it4i/software/comsol/licensing-and-available-versions.md

docs.it4i/software/isv_licenses.md

docs.it4i/software/openfoam.md

mkdocs.yml

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