You should add some screenshots so people can at least see what you're trying to sell. That's one of the first things I look for with anything like this so I can get a feel for what's being offered.
Otherwise maybe it's prematurely on HN if you wanted to get best value for hitting the front page?
Definitely needs screenshots. It's nice to say that you can "manage your pages clearly in tree structure" but I'd like to see what it looks like without trying.
Also, it definitely needs an "About" page. Who are you people?
Just put a link to this on your landing page. Honestly, I am rarely interested in what the creator of a product wants to tell me about it. I just want a brief description of what it is and why I might want to use it, and pictures. A demo is better again, bit I want to see your product, not read about it.
Well the problem now is that you've got your publicity before you were ready for it. Now when you do have a demo, your publicity has already been and gone.
I like the landing page. It looks good. But without a demo, you're already just-another-startup.
"We're sorry but something went wrong"
That's an immediate double fail on the "simplest way to make a wiki" headline.