Change link to api documentation in README to a badge

README.md

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 ![Norfair by Tryolabs logo](docs/logo.png)
 
- [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/tryolabs/norfair/blob/master/demos/yolov4/yolov4_demo.ipynb) ![Build status](https://github.com/tryolabs/norfair/workflows/CI/badge.svg?branch=master) [![DOI](https://zenodo.org/badge/276473370.svg)](https://zenodo.org/badge/latestdoi/276473370)
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/tryolabs/norfair/blob/master/demos/yolov4/yolov4_demo.ipynb) [![Documentation](https://img.shields.io/badge/api-reference-blue.svg)](https://github.com/tryolabs/norfair/blob/master/docs/README.md) ![Build status](https://github.com/tryolabs/norfair/workflows/CI/badge.svg?branch=master) [![DOI](https://zenodo.org/badge/276473370.svg)](https://zenodo.org/badge/latestdoi/276473370)
 
 Norfair is a customizable lightweight Python library for real-time 2D object tracking.
 
@@ -92,10 +92,6 @@ Trying out the latest state of the art detectors normally requires running repos
 
 Norfair was born out of the need to quickly add a simple layer of tracking over a wide range of newly released SOTA detectors. It was designed to seamlessly be plugged into a complex, highly coupled code base, with minimum effort. Norfair provides a series of modular but compatible tools, which you can pick and chose to use in your project.
 
-## Documentation
-
-:blue_book: You can find the documentation for Norfair's API [here](docs/README.md).
-
 ## Examples
 
 We provide several examples of how Norfair can be used to add tracking capabilities to several different detectors.