IGNITE-16271 Repair broken image in README. Fixes #95

Signed-off-by: Slava Koptilin <slava.koptilin@gmail.com>

README.md

@@ -1,6 +1,6 @@
 # Apache Ignite Extensions
 
-<a href="https://ignite.apache.org/"><img src="https://github.com/apache/ignite-website/blob/master/images/ignite_logo_full.svg" hspace="20"/></a>
+<a href="https://ignite.apache.org/"><img src="https://github.com/apache/ignite-website/blob/master/assets/images/apache_ignite_logo.svg" hspace="20"/></a>
 
 [![GitHub](https://img.shields.io/github/license/apache/ignite?color=blue)](https://www.apache.org/licenses/LICENSE-2.0.html)
 [![GitHub release](https://img.shields.io/badge/release-download-brightgreen.svg)](https://ignite.apache.org/download.cgi#extensions)