docs update + removing unused code from parallel_actor

docs/docs/index.md

@@ -2,7 +2,7 @@
 
 ## Motivation
 
-Enable easy design and training of state-of-the-art reinforcement learning algorithms with multiple environments
+Train and evaluate reinforcement learning agents by harnessing the power of multi-core CPU processing to achieve state-of-the-art results. Provide a sandbox for easing the development process of new algorithms through a modular design and an elegant set of APIs. 
 
 ## Solution
 

docs/mkdocs.yml

@@ -1,5 +1,5 @@
 site_name: Reinforcement Learning Coach Documentation
-theme: material
+theme: readthedocs
 site_description: 'Reinforcement Learning Coach Documentation by Intel Nervana.'
 markdown_extensions: 
 - mdx_math: