First work around ArContext documentation.

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+Overview
+========
+
+This section explains how to wrap any pipeline detailled in previous sections into various context. 
+
+First, let's look at the schema below: it gives an overview of the main notions involved in the following chapters.
+
+![Pipeline input context](../../img/pipeline_input_context.png)
+
+To build your own input context, you need to know:
+
+* [How to define a context class](context_definition.md),
+* [How to load and connect a context](configuration_and_connection.md),
+* [How to visualize a context](visualization.md),
+* [How to pause and resume a context](pause_and_resume.md)