fix: Update project roadmap link

It pointed at an old roadmap that no longer exists. We have a new one :)

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

index.html

@@ -108,7 +108,7 @@
             Firecracker can run Linux and
             <a href="http://blog.osv.io/blog/2019/04/19/making-OSv-run-on-firecraker">OSv</a>
             guests. Our latest roadmap can be found
-            <a href="https://github.com/firecracker-microvm/firecracker/projects/13">here</a>.
+            <a href="https://github.com/orgs/firecracker-microvm/projects/42">here</a>.
           </p>
         </section>
       </article>