Run tutorial for commercial softwares

[tmigot]

I have a ready-to-test branch: https://github.com/JuliaSmoothOptimizers/JSOTutorials.jl/tree/add-knitro-tuto

This is connected to JuliaSmoothOptimizers/JuliaSmoothOptimizers.github.io#51

• https://juliasmoothoptimizers.github.io/HSL.jl/dev/tutorial/
• https://juliasmoothoptimizers.github.io/NLPModelsKnitro.jl/dev/tutorial/