Get systems pages ready for deployment

_config.yml

_includes/psitem.html

_layouts/system.html

systems/TNTBase.md

systems/active.md

systems/arXMLiv.md

systems/cpoint.md

systems/jomdoc.md

systems/kat.md

systems/krextor.md

systems/llamapun.md

systems/mathhub.md

systems/meta/README.md

systems/meta/historic.md

systems/meta/index.md

systems/mmt.md

systems/mws.md

systems/omdoc.md

systems/openmathmap.md

systems/sTeX.md