Plugin installation : Unable to read repository

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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).

Start with the installation links and the Eclipse error for https://mapstruct.org/eclipse/content.xml. Inspect the mapstruct.org static/eclipse directory and its deployment, especially the reported absence of content.xml. Done means the repository can be read successfully and the plugin installs from the website and Eclipse Marketplace.

Written by the indexing model from the issue text.