Update Readme

Author: diehlpk

about.md

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-A medium inspired Jekyll blog theme. The basic idea came from the Ghost theme 
-[Readium 2.0](http://www.svenread.com/readium-ghost-theme/). I use mediator on my own blog [The Base](blog.base68.com).
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-You can **download** the theme here:
-[https://github.com/dirkfabisch/mediator](https://github.com/dirkfabisch/mediator) 
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-You can find out more info about customizing your Jekyll theme, as well as basic Jekyll usage documentation at [jekyllrb.com](http://jekyllrb.com/)
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-You can find the source code for the Jekyll new theme at: [github.com/jglovier/jekyll-new](https://github.com/jglovier/jekyll-new)
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-You can find the source code for Jekyll at [github.com/jekyll/jekyll](https://github.com/jekyll/jekyll)
+Webpage of the [Book](https://link.springer.com/book/10.1007/978-3-031-54369-2) "Parallel C++: Efficient and Scalable High-Performance Parallel Programming Using HPX".