I don't have git on my laptop either as a commandline tool or via some IDE. (I'm hitchhiking around the world with a little netbook.)
Copying and pasting from my favourite text editor to/from Git works just fine.
I also have a proper GitHub account where I have forked some projects, edited little fixes right in the GitHub online editor and issues pull requests upstream. So far for the kind of stuff I'm doing the online tools or GitHub are fine without a commandline or IDE.
But now I'm wondering is there a way to "promote" something which is currently a gist into a full-fledged GitHub project?