add a static svg, looks nicer

Author: koaning

_static/molab.svg

@@ -21,7 +21,7 @@
     <img src="{{ pathto('_static/colab.svg', 1) }}" alt="Open In Colab"/></a>
 
     <a href="{{ 'https://molab.marimo.io/github/' + gh_basepath + file_path }}" target="_blank">
-    <img src="https://marimo.io/molab-shield.png" alt="Open In molab"/></a>
+    <img src="{{ pathto('_static/molab.svg', 1) }}" alt="Open In molab"/></a>
   </p>
 </div>
 {% endif %}