Should we be close duplicates of questions that came from other SE sites?
No, we shouldn't.
Let me quote Thomas Owens from Math.SE - Vote to Close as Exact Duplicate:
From my perspective, the existence of MathOverflow has nothing to do with anything here.
In fact, life should go on as if it doesn't exist because this is a totally separate site.
While MathOverflow is a non-SE site, we should have the same behavior with other SE sites.
We must see if the question could fit on our site, not if it could fit on other sites...
Which brings us to:
Should the question be closed?
Yes, it needs improvement...
Let me quote the about page:
We are a site for expert programmers interested in subjective discussions on software development.
I'm sure bad website designs can be learned from and might fit in our domain,
but the question is stated similar to requesting people for their desktop wallpapers...
So I see it right to close this question for off-topic reasons, but it's not a duplicate in my eyes.