Update hc.css
Update hc.css

removed dead @import font link, added Helvetica and Open Sans as fall back if client doesn't have Helvetica Neue
shaawnee/herring-cove,Rettroix/fanworks,grahammutter/grahammutter.github.io,radioku5e/radioku5e.github.io,kaziridwan/herring-cove,Rettroix/Spyrofanworks,Rettroix/fanworks,luzc08/herring-cove,amrme/osdev4arab.github.io,proofreading-website/KLC,ashokpant/herring-cove,kaziridwan/herring-cove,jemaf/jemaf.github.com,bian17888/haike,Rettroix/Spyrofanworks,arnp/herring-cove,amrme/osdev4arab.github.io,RadwaKamal/osdev4arab.github.io,hussfelt/herring-cove,grahammutter/grahammutter.github.io,arnp/herring-cove,iocoder/osdev4arab.github.io,jemaf/jemaf.github.com,harishankarv/herring-cove,janhaak/personal-website,ashokpant/herring-cove,Rettroix/Spyrofanworks,tommydevdocs/herring-cove,tommydevdocs/herring-cove,janhaak/personal-website,luzc08/herring-cove,harishankarv/herring-cove,radioku5e/radioku5e.github.io,RadwaKamal/osdev4arab.github.io,bian17888/haike,osdev4arab/osdev4arab.github.io,osdev4arab/osdev4arab.github.io,Rettroix/fanworks,iocoder/osdev4arab.github.io,shaawnee/herring-cove