Update index.md

you-and-hifis/index.md

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 Our purpose is to support you, as a scientist, Helmholtz employee or research project.
 To this aim, since summer 2019, we are setting up the HIFIS platform, that is building
 
-- the [**Helmholtz Cloud**](/cloud-platform), providing a portfolio of seamlessly accessible IT services to simplify your daily work,
+- the [**Helmholtz Cloud**](../cloud-platform), providing a portfolio of seamlessly accessible IT services to simplify your daily work,
 - a **Helmholtz-wide login mechanism**, the [Helmholtz AAI]({% post_url 2020/07/2020-07-24-helmholtz-aai %}),
 - a stable, high-bandwidth **network infrastructure** connecting all Helmholtz centers,
 - [**Software services**](#software-services) to provide you with a common platform,