Change Harp Platform to Harp

Just a minor clarification! <a href="http://harpjs.com">Harp</a> is our open source project, <a href="https://www.harp.io">Harp Platform</a> is our publishing platform integrated with Dropbox.

Looking forward to trying out Harp on Octohost, looks really cool! :octopus: We’ll make sure to cover it on our blog  in the near future.