Rework overview (#16)

* Rework overview * Update overview.rst
nstack · Feb 19, 2017 · 198a21b · 198a21b
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 .. _what_is_nstack: 
 
-What is NStack?
+Why NStack?
 ===============
 
-NStack is a self-service analytics platform which lets teams deploy and productionise data-driven code without writing complex infrastructure or relying on an engineering team. Once you deploy your code to NStack, it can be used in workflows alonside production systems (such as databases, your data warehouse, HTTP endpoints, or realtime systems) to accomplish sophisticated data-driven tasks in the cloud. This lets teams answers questions more quickly.
+Productionise your data-driven code without an engineering team or complex infrastructure.
+
+Deploy workloads as safe, reusable, and reliable modules. Integrate with your existing data stores and event sources. Combine and compose powerful workflows quickly and effortlessly.