Rework demo code on front page

[dwt]

I think that demo is quite good, but we missed a big chance by writing out 'hello world' instead of using the correct emoji for that sentence. It just has to be:

👋🌎

no way around it. Currently it just feels so uncomfortably incomplete.

[rehaut]

I fully support this request.

[joeskeen]

So more like this?

🏁🍇
    😀 🔤👋🌎🔤❗
🍉

Edit: this issue belongs in https://github.com/emojicode/emojicode.github.io

[dwt]

@joeskeen Exactly.