Fix images in README.

Author: kattni

README.rst

@@ -16,13 +16,10 @@ Introduction
 
 This high level library provides objects that represent Circuit Playground Express and Bluefruit hardware.
 
-.. image :: ../docs/_static/circuit_playground_express_small.jpg
-    :target: https://adafruit.com/product/3333
-    :alt: Circuit Playground Express
-
-.. image :: ../docs/_static/circuit_playground_bluefruit_small.jpg
-    :target: https://adafruit.com/product/4333
-    :alt: Circuit Playground Bluefruit
+<a href="http://www.adafruit.com/products/3333"><img src="/docs/_static/circuitplayground_express.jpg" width="500px"><br/>
+Circuit Playground Express</a><br/>
+<a href="http://www.adafruit.com/products/4333"><img src="/docs/_static/circuit_playground_bluefruit.jpg" width="500px"><br/>
+Circuit Playground Bluefruit</a><br/>
 
 Installation
 =============