fix(docs): working link to manual of Native Image Maven Plugin

[reitzig]

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Fixes #175 🛠️

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[reitzig]

I don't know if https://graalvm.github.io/native-build-tools/latest/maven-plugin.html is the best resource, but I was able to get the build running using it.

[reitzig]

@mpeddada1 , anything I can do to move this forward?

(picking you out of the list of recent committers, sorry if you're the wrong person to ping)

[mpeddada1]

Thanks for your contribution @reitzig! You're right, it looks like this page was recently moved to https://graalvm.github.io/native-build-tools/latest/maven-plugin.html