Update test

Author: fortierq

tests/test_build/build__header-article.html

@@ -59,7 +59,7 @@
       <li>
        <a class="headerbtn" data-placement="left" data-toggle="tooltip" href="https://notebook.basthon.fr/?from=https://raw.githubusercontent.com/executablebooks/sphinx-book-theme/master/TESTPATH/section1/ntbk.ipynb" title="Launch on Basthon">
         <span class="headerbtn__icon-container">
-         <img src="../_static/images/logo_basthon.svg"/>
+         <img src="../_static/images/logo_basthon.png"/>
         </span>
         <span class="headerbtn__text-container">
          Basthon