Why has my checkout page disappeared?

Hi guys,

Yesterday i was fixing some things in my store and trying to customize shopping process.

Added to cart few items and went to checkout - and to my surprise, nothing happened when i clicked it.

(last week everything was working, i changed some things in template editor) but now its not working.

I went to edit code page and tried to find page responsible for checkout, but i cant find it there..

I don’t know how is that possible, maybe i missed something, but everything was working until it didnt’t.

Any Ideas on what do do? URL: urban-diamond-2.myshopify.com - its password protected

Cheers