Add new ARA logo to README and documentation

Jason Rist created and contributed this nice logo for ARA, let's
start using it !
It will make it's way into the UI in the upcoming refactor.

Change-Id: I4c956a037039967341f14d43c797af6160bc9e9d
Co-Authored-By: Jason E. Rist <jrist@redhat.com>
Co-Authored-By: David Moreau Simard <dms@redhat.com>

Author: David Moreau-Simard

README.rst

@@ -1,5 +1,7 @@
 ARA: Ansible Run Analysis
 =========================
+.. image:: doc/source/_static/ara-with-icon.png
+
 tl;dr
 -----
 ARA_ records Ansible_ Playbook runs seamlessly to make them easier to

doc/source/_static/ara-with-icon.png

@@ -1,5 +1,6 @@
 Welcome to the ARA documentation!
 =================================
+.. image:: _static/ara.png
 
 Table of Contents
 =================