fix logo path

README.md

@@ -18,7 +18,7 @@ Platform-as-a-Service.  It benefits directly from the experience
 accumulated over several years of large-scale operation and support of
 hundreds of thousands of applications and databases.
 
-![Docker L](docs/sources/concepts/images/dockerlogo-h.png "Docker")
+![Docker L](docs/sources/static_files/dockerlogo-h.png "Docker")
 
 ## Better than VMs