chore: Remove logo from readme (#1768)

README.md

@@ -10,8 +10,6 @@
 [![Join the chat at https://gitter.im/dequelabs/axe-core](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/dequelabs/axe-core?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Package Quality](http://npm.packagequality.com/shield/axe-core.svg)](http://packagequality.com/#?package=axe-core)
 
-![Axe Logo](doc/axelogo2018.png)
-
 Axe is an accessibility testing engine for websites and other HTML-based user interfaces. It's fast, secure, lightweight, and was built to seamlessly integrate with any existing test environment so you can automate accessibility testing alongside your regular functional testing.
 
 [Sign up for axe news](https://hubs.ly/H0fsN0b0) to get the latest on axe features, future releases, and events.