[Documentation] Fix the path to OpenFPGA logo in the README
-# Getting Started with OpenFPGA <img src="./docs/source/figures/OpenFPGA_logo.png" width="200" align="right">
+# Getting Started with OpenFPGA <img src="./docs/source/overview/figures/OpenFPGA_logo.png" width="200" align="right">
[![Build Status](https://travis-ci.com/LNIS-Projects/OpenFPGA.svg?branch=master)](https://travis-ci.com/LNIS-Projects/OpenFPGA)
[![Documentation Status](https://readthedocs.org/projects/openfpga/badge/?version=master)](https://openfpga.readthedocs.io/en/master/?badge=master)
