update footer to point to new DOE logo

Author: hauten

_includes/footer.html

@@ -21,7 +21,7 @@
 
       <div class="col-xs-12 col-sm-5 col-lg-3" id="footer-affiliates">
         <a class="llns" href="http://www.llnsllc.com/" target="_blank" rel="noopener noreferrer"><img src="/assets/images/llns.png" alt="LLNS"></a>
-        <a class="doe" href="https://www.energy.gov/" target="_blank" rel="noopener noreferrer"><img src="/assets/images/doe_small.png" alt="U.S. DOE"></a>
+        <a class="doe" href="https://www.energy.gov/" target="_blank" rel="noopener noreferrer"><img src="/assets/images/doe_white_2025.png" alt="U.S. DOE"></a>
         <a class="nnsa" href="https://www.energy.gov/nnsa/national-nuclear-security-administration/" target="_blank" rel="noopener noreferrer"><img src="/assets/images/nnsa.png" alt="NNSA"></a>
       </div>