Fix crate source code links

Author: jplatte

templates/project.html

@@ -18,7 +18,7 @@ <h2 class="page-title">{{ page.title }}</h2>
         <ul>
             <li><a href="https://crates.io/crates/{{ crate }}">crates.io page</a></li>
             <li><a href="https://docs.rs/{{ crate }}">Documentation</a></li>
-            <li><a href="{{ repo }}/tree/main/{{ crate }}">Code</a></li>
+            <li><a href="{{ repo }}/tree/main/crates/{{ crate }}">Code</a></li>
             <li>
                 <a href="{{ repo }}/issues?q=is%3Aissue+is%3Aopen+label%3Acrate%2F{{ crate }}">
                     Issues