Removed QChem fro list due to expired licence

Author: aturner-epcc

docs/research-software/index.md

@@ -35,7 +35,6 @@ fully-supported software stack are marked with *):
   - [ONETEP](onetep.md)
   - [OpenFOAM](openfoam.md)
   - [ORCA(*)](orca.md)
-  - [QChem(*)](qchem.md)
   - [Quantum Espresso](qe.md)
   - [VASP](vasp.md)