Update logo in README with a smaller version

Author: igorpecovnik

README.md

@@ -1,5 +1,5 @@
 <h2 align="center">
-  <img src="https://raw.githubusercontent.com/armbian/.github/master/profile/logo.png" alt="Armbian logo" width="25%">
+  <a href=#><img src="https://raw.githubusercontent.com/armbian/.github/master/profile/logosmall.png" alt="Armbian logo"></a>
   <br><br>
 </h2>