Configure github links instead of gitweb in gerrit UI

[gitweb]
    url = http://github.com/Altoros
    linkname = github
    revision = /${project}/commit/${commit}
    project = /${project}
    branch = /${project}/branches/${branch}
    filehistory = /${project}/commits/${branch}/${file}

Notice Altoros in gitweb.url option. There no proper placeholder for github account there.