Plugin installation : Unable to read repository

Nadie ha tomado este issue todavía.

Hello,

When installing the plugin from [mapstruct website](https://mapstruct.org/documentation/ide-support/) or from [eclipse marketplace](https://marketplace.eclipse.org/content/mapstruct-eclipse-plugin), I have this error in eclipse:
```
Unable to read repository at https://mapstruct.org/eclipse/content.xml.
Certificate for doesn't match any of the subject alternative names: [*.github.com, www.github.com, github.io, github.com, *.github.io, githubusercontent.com, *.githubusercontent.com]
```
Can you look into it ?

I searched a little the website repository and found that there is no content.xml file in the [static/eclipse](https://github.com/mapstruct/mapstruct.org/tree/master/static/eclipse) folder, maybe it is related ? (I don't know anything about how to deploy and develop an eclipse plugin).

Comienza con los enlaces de instalación y el error de Eclipse para https://mapstruct.org/eclipse/content.xml. Inspecciona el directorio estático eclipse de mapstruct.org y su despliegue, especialmente la ausencia de content.xml indicada. Se considera completado cuando el repositorio se puede leer correctamente y el plugin se instala desde el sitio web y Eclipse Marketplace.

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