remove outdated link

Author: fangohr

Readme.md

@@ -16,8 +16,7 @@ The book is available as
   ([Use JupyterLab](https://mybinder.org/v2/gh/fangohr/introduction-to-python-for-computational-science-and-engineering/master?urlpath=lab/tree/index.ipynb) instead of the traditional Notebook.)
 
 - html ([online](https://fangohr.github.io/introduction-to-python-for-computational-science-and-engineering/)
-  or [in this zip file in the docs folder](https://github.com/fangohr/introduction-to-python-for-computational-science-and-engineering/archive/master.zip) or
-  [here for online browsing](docs/index.html))
+  or [in this zip file in the docs folder](https://github.com/fangohr/introduction-to-python-for-computational-science-and-engineering/archive/master.zip)
 - [pdf](https://github.com/fangohr/introduction-to-python-for-computational-science-and-engineering/raw/master/pdf/Introduction-to-Python-for-Computational-Science-and-Engineering.pdf)
 - downloadable Jupyter Notebook files (`*.ipynb`) ([in this zip file](https://github.com/fangohr/introduction-to-python-for-computational-science-and-engineering/archive/master.zip))