[SYSTEMML-1212] Link to main website in header of project docs
[SYSTEMML-1212] Link to main website in header of project docs

Link logo and title to main website.

Closes #367.

deroneriksson/systemml,asurve/arvind-sysml2,iyounus/incubator-systemml,deroneriksson/incubator-systemml,dhutchis/systemml,gweidner/incubator-systemml,gweidner/systemml,niketanpansare/systemml,apache/incubator-systemml,apache/incubator-systemml,asurve/arvind-sysml2,gweidner/incubator-systemml,nakul02/incubator-systemml,dusenberrymw/incubator-systemml,nakul02/incubator-systemml,nakul02/systemml,nakul02/incubator-systemml,sandeep-n/incubator-systemml,deroneriksson/systemml,nakul02/incubator-systemml,niketanpansare/systemml,iyounus/incubator-systemml,gweidner/incubator-systemml,niketanpansare/incubator-systemml,asurve/incubator-systemml,dhutchis/systemml,gweidner/systemml,apache/incubator-systemml,akchinSTC/systemml,akchinSTC/systemml,asurve/systemml,fschueler/incubator-systemml,dusenberrymw/systemml,gweidner/incubator-systemml,niketanpansare/systemml,fschueler/incubator-systemml,sandeep-n/incubator-systemml,gweidner/systemml,asurve/arvind-sysml2,dusenberrymw/systemml,niketanpansare/systemml,iyounus/incubator-systemml,gweidner/systemml,dusenberrymw/incubator-systemml,apache/incubator-systemml,niketanpansare/incubator-systemml,nakul02/systemml,asurve/arvind-sysml2,nakul02/systemml,deroneriksson/systemml,asurve/incubator-systemml,akchinSTC/systemml,asurve/incubator-systemml,dusenberrymw/systemml,iyounus/incubator-systemml,asurve/systemml,dhutchis/systemml,gweidner/systemml,gweidner/systemml,iyounus/incubator-systemml,gweidner/incubator-systemml,gweidner/incubator-systemml,fschueler/incubator-systemml,deroneriksson/incubator-systemml,nakul02/systemml,asurve/arvind-sysml2,asurve/systemml,deroneriksson/incubator-systemml,niketanpansare/incubator-systemml,deroneriksson/systemml,sandeep-n/incubator-systemml,asurve/incubator-systemml,deroneriksson/incubator-systemml,dusenberrymw/incubator-systemml,deroneriksson/systemml,dusenberrymw/incubator-systemml,nakul02/systemml,asurve/systemml,dhutchis/systemml,deroneriksson/systemml,iyounus/incubator-systemml,apache/incubator-systemml,nakul02/incubator-systemml,asurve/systemml,akchinSTC/systemml,sandeep-n/incubator-systemml,fschueler/incubator-systemml,akchinSTC/systemml,asurve/incubator-systemml,asurve/systemml,apache/incubator-systemml,niketanpansare/incubator-systemml,niketanpansare/systemml,dusenberrymw/incubator-systemml,dhutchis/systemml,akchinSTC/systemml,deroneriksson/incubator-systemml,asurve/incubator-systemml,nakul02/systemml,asurve/arvind-sysml2,deroneriksson/incubator-systemml,nakul02/incubator-systemml,dusenberrymw/systemml,dusenberrymw/incubator-systemml,dusenberrymw/systemml,dhutchis/systemml,niketanpansare/systemml,dusenberrymw/systemml