add odsc logo locally

Author: Reshama

layouts/_default/sponsors.html

@@ -280,7 +280,7 @@ <h2>Hamiltonian Monte Carlo</h2>
             </div>
             <div class="sponsor_logo">
                 <a href="https://odsc.com/california/?utm_source=pymc&utm_medium=referral" target="_blank">
-                    <img src="https://github.com/pymc-devs/brand/blob/main/sponsors/sponsor_logos/odsc/odsc_white.png?raw=true" alt="ODSC logo">
+                    <img src="/images/sponsors_logos/odsc_white.png" alt="ODSC logo">
                 </a>
             </div>
         </div>