Replace wiki reference with main site in doc/README.md
Replace wiki reference with main site in doc/README.md

namecoin/namecoin-core,brandonrobertz/namecoin-core,brandonrobertz/namecoin-core,domob1812/huntercore,domob1812/namecore,pataquets/namecoin-core,domob1812/namecore,domob1812/namecore,domob1812/namecore,namecoin/namecore,namecoin/namecore,namecoin/namecore,domob1812/namecore,pataquets/namecoin-core,namecoin/namecore,domob1812/huntercore,domob1812/huntercore,brandonrobertz/namecoin-core,domob1812/huntercore,pataquets/namecoin-core,brandonrobertz/namecoin-core,pataquets/namecoin-core,pataquets/namecoin-core,brandonrobertz/namecoin-core,pataquets/namecoin-core,domob1812/huntercore,namecoin/namecoin-core,namecoin/namecore,brandonrobertz/namecoin-core,namecoin/namecoin-core,domob1812/huntercore,domob1812/namecore,namecoin/namecoin-core,namecoin/namecore,namecoin/namecoin-core,namecoin/namecoin-core