Remove reccomendation to use sudo

[kennethormandy]

We could add a You may need to preface this command with sudo note wherever we recommend it, which is what we do on the blog sometimes: sintaxi/harp#439

[nelsonic]

Agreed @kennethormandy
Encouraging new developers to use sudo to install node modules where it isn't (usually) required, is pretty bad...

https://github.com/harp/harpjs.com/blob/master/public/_shared/install.jade#L4

Instead you could point people to: http://stackoverflow.com/questions/16151018/npm-throws-error-without-sudo

[iammatthias]

Is it just me, or is Harp installing just fine without sudo now? Just installed 0.21.0 on a new computer, and it worked perfectly.

[manavm1990]

It's just you. Before I saw this I just made a recommendation for the same thing about removing sudo from recco.