Update link to Hampath in README.md

@ocots link towards hampath.org now broken. redirecting to inria gitlab. moving hampath towards github would probably be nicer.

Author: jbcaillau

README.md

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-The control-toolbox ecosystem gathers Julia packages for mathematical control and applications. It is an outcome of a research initiative supported by the [Inria Centre at Université Côte d'Azur](https://www.inria.fr/en/inria-centre-universite-cote-azur) and the [Labex CIMI (Centre International de Mathématiques et Informatique de Toulouse) at Université de Toulouse](https://www.cimi.univ-toulouse.fr/fr/) and a sequel to previous developments, notably [Bocop](https://www.bocop.org) and [Hampath](https://www.hampath.org). See also: [ct gallery](https://ct.gitlabpages.inria.fr/gallery). The root package is [OptimalControl.jl](https://github.com/control-toolbox/OptimalControl.jl) which aims to provide tools to solve optimal control problems by direct and indirect methods, both on CPU and GPU.
+The control-toolbox ecosystem gathers Julia packages for mathematical control and applications. It is an outcome of a research initiative supported by the [Inria Centre at Université Côte d'Azur](https://www.inria.fr/en/inria-centre-universite-cote-azur) and the [Labex CIMI (Centre International de Mathématiques et Informatique de Toulouse) at Université de Toulouse](https://www.cimi.univ-toulouse.fr/fr/) and a sequel to previous developments, notably [Bocop](https://www.bocop.org) and [Hampath](https://gitlab.inria.fr/ct/hampath/-/blob/master/README.md). See also: [ct gallery](https://ct.gitlabpages.inria.fr/gallery). The root package is [OptimalControl.jl](https://github.com/control-toolbox/OptimalControl.jl) which aims to provide tools to solve optimal control problems by direct and indirect methods, both on CPU and GPU.
 
 ## Getting started