replace /learn/Getting-started-with-Types.elm link by /guide/model-the-problem
replace /learn/Getting-started-with-Types.elm link by /guide/model-the-problem
jvoigtlaender/elm-lang.org,FranklinChen/elm-lang.org,jvoigtlaender/elm-lang.org,FranklinChen/elm-lang.org