Update link URL in README.md

Author: bgroenks96

README.md

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-[Terrarium.jl](https://tum-pik-esm.github.io/Terrarium.jl/dev) is a new and upcoming framework for hybrid physics- and data-driven land modeling across spatial and temporal scales. We envision Terrarium to be part of a new generation of Earth system component models that combine modularity, interactivity, GPU-compability and auto-differentiability (AD) for seamless integration of process-based and data-driven model components in both global and regional scale simulations.
+[Terrarium.jl](https://numericalearth.github.io/Terrarium.jl/dev) is a new and upcoming framework for hybrid physics- and data-driven land modeling across spatial and temporal scales. We envision Terrarium to be part of a new generation of Earth system component models that combine modularity, interactivity, GPU-compability and auto-differentiability (AD) for seamless integration of process-based and data-driven model components in both global and regional scale simulations.
 
 Terrarium is being developed alongside [SpeedyWeather.jl](https://github.com/SpeedyWeather/SpeedyWeather.jl) and [Oceananigans.jl](https://github.com/CliMA/Oceananigans.jl) as the land component of a new, user-friendly, and fully GPU/AD-compatible Earth System Model in the Julia programming language.