Updated readme and workflow names

.github/workflows/build-docs.yml

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-name: Build documentation
+name: Deploy documentation
 
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   push:

.github/workflows/test.yml

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-name: Test
+name: Run unit tests
 
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README.md

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-# libgran ![Unit tests workflow badge](https://github.com/egor-demidov/libgran/actions/workflows/test.yml/badge.svg)
+# libgran ![Unit tests workflow badge](https://github.com/egor-demidov/libgran/actions/workflows/test.yml/badge.svg) ![Documentation deployment workflow badge](https://github.com/egor-demidov/libgran/actions/workflows/build-docs.yml/badge.svg)
 
 libgran is a Discrete Element Method (DEM) framework for simulating the mechanical behavior of soot aggregates. DEM is a
 technique for simulation of granular media consisting of rigid spherical particles. The resultant force and torque acting

Writerside/hi.tree

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                  name="libgran documentation"
                  start-page="Installation.md">
 
+    <toc-element topic="Overview.md"/>
     <toc-element topic="Installation.md"/>
     <toc-element topic="Tutorials.md">
         <toc-element topic="Example-simulation.md"/>

Writerside/topics/Overview.md

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+# Overview
+
+libgran is a Discrete Element Method (DEM) framework for simulating the mechanical behavior of soot aggregates. DEM is a
+technique for simulation of granular media consisting of rigid spherical particles. The resultant force and torque acting
+on each particle are computed and used with Newton's second law to compute the motion of particles:
+```tex
+m\ddot{\mathbf{x}}=\mathbf{f}
+```
+```tex
+I\ddot{\omega}=\bm{\tau}
+```
+The forces that particles experience arise from friction at inter-particle contacts, bonding between particles,
+inter-particle attraction, field forces, etc. libgran contains a bonded and a non-bonded contact model, a Van der Waals
+attraction model and is designed to be easily extensible with custom models.