Update laptops.html

_includes/sections/laptops.html

@@ -10,7 +10,7 @@
 
      {% include card.html color="primary"
     title="Minifree"
-    image="/assets/img/tools/minifree"
+    image="/assets/img/tools/minifree.png"
     url="https://minifree.org/"
     description="Minifree sells hardware with zero non-free drivers. All of there laptops come pre-installed with LibreBoot."
     %}