Dockerhub issue 3662 (#3710)

* Adding dockerhub badge to readme #3662

* Adding dockerhub badge to sphinx index.html #3662

Author: zscore

README.rst

@@ -3,7 +3,7 @@
     :alt: PyMC3 logo
     :align: center
 
-|Build Status| |Coverage| |NumFOCUS_badge| |Binder|
+|Build Status| |Coverage| |NumFOCUS_badge| |Binder| |Dockerhub|
 
 PyMC3 is a Python package for Bayesian statistical modeling and Probabilistic Machine Learning
 focusing on advanced Markov chain Monte Carlo (MCMC) and variational inference (VI)
@@ -192,6 +192,8 @@ Sponsors
    :target: https://travis-ci.org/pymc-devs/pymc3
 .. |Coverage| image:: https://codecov.io/gh/pymc-devs/pymc3/branch/master/graph/badge.svg
   :target: https://codecov.io/gh/pymc-devs/pymc3
+.. |Dockerhub| image:: https://img.shields.io/docker/automated/pymc/pymc3.svg
+  :target: https://hub.docker.com/r/pymc/pymc3
 .. |NumFOCUS| image:: https://www.numfocus.org/wp-content/uploads/2017/03/1457562110.png
    :target: http://www.numfocus.org/
 .. |Quantopian| image:: https://raw.githubusercontent.com/pymc-devs/pymc3/master/docs/quantopianlogo.jpg

docs/source/semantic_sphinx/layout.html

@@ -92,6 +92,9 @@ <h2>Probabilistic Programming in Python</h2>
         <a class="ui image" href="https://www.numfocus.org/">
             <img src="https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A">
         </a>
+        <a class="ui image" href="https://hub.docker.com/r/pymc/pymc3">
+            <img src="https://img.shields.io/docker/automated/pymc/pymc3.svg">
+        </a>
     </div>
     {% endif %}