That looks like a great site to try and reproduce! I haven't done treehouse, but in my experience, going from online tutorials (like Codecademy or Dash) to building something myself was tricky because I just didn't understand how to set everything up.
I was taking a class though, and all we started with was Sublime and CodeKit. I think if you want to just start practising your styling/layouts etc, then CodeKit is so useful. It auto refreshes your browser so you can see the changes as you code, and it automatically detects and compiles your sass to css, and has a bunch of other features that makes it really easy to try things (like Bootstrap). It can only be used on macs though, and it costs, although you can trial for a month (or for as long as you keep the application open and never shut down).
Another option is to work through a video tutorial. Something like DevTips, which is also good if you want to dive straight into using Jekyll and git, etc.
I'm not sure what level you're at, so I'm sorry if any of that is obvious/too basic. I personally think it's better to leave something like Jekyll for a bit later because it takes a while to get going. I've started using it and running into a lot of new things, like liquid and markdown. It's fun, but I'm not feeling very productive yet!