Update index.md

Author: BenLauwens

docs/src/index.md

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-# SimJulia
+# Overview
 
-a combined continuous time / discrete event process oriented simulation framework written in [Julia](http://julialang.org/) inspired by the Simula library [DISCO](http://www.akira.ruc.dk/~keld/research/DISCO/), the Python library [SimPy](https://simpy.readthedocs.io/) and the standalone [QSS](https://sourceforge.net/projects/qssengine/) solver.
+SimJulia is discrete event process oriented simulation framework written in [Julia](http://julialang.org/) inspired by the Python library [SimPy](https://simpy.readthedocs.io/).