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The site for English Language Learners was stood up in large part so that non-native speakers could have a place where their questions, which would be regarded by some to be "too basic" for ELU, could ask their questions. The site was stood up in January of this year.
Now, to me that means that the poor site was left waiting for someone who never showed up. However, the author of the question (J.R., one of our highest rep users) seems to be using it to mean was set up. Is this common usage? Is it from a particular dialect? I have never come across it before and cannot find it in the dictionary definitions that I checked.
Given that I have a computer science background with more than a decade of government service, I suppose it makes the expression sound especially natural to my ear. (As I've said in other answers and comments, the longer you are familiar with some expression, the easier it is to presume others are familiar with it, too.)