Yes, that might be a stupid question, but I am willing to hire a person who will take our technical documents (internal) and produce a website which describe the product in a clear way.
Did you hire an external?
What's the title shall I use, if I want to publish an ad for it?
Feel free to recommend me one.
Id say try freelancer, odesk, etc but be very clear about what you want and expect to test out a lot of people with small tests before you find someone who is good. Once found get them on it fulltime for a few days or weeks until its done.
A great trick is to hide in the spec you give them a sentence that asks them to bring X up, this way you can tell if they read it or not.