fix(downloads): point the wowlet link at the surface that has releases

The desktop wallet tile linked to codeberg.org/wownero/wowlet/releases,
where the newest release is 5.0.3 from June. The whole 5.1 line, 5.1.0
through 5.1.2, is published on GitHub only, so anyone using the front
door got a build three releases old and missed the fix that stops the
wallet offering to mine on someone else's node.

Nothing in the wallet made up for it: CHECK_UPDATES is off in every
release build, so a shipped wowlet never checks for a newer one. The
download page is the only route a user has.

Codeberg stays a code mirror.

Claude-Session: https://claude.ai/code/session_0163TepHAxDp8WQe7hyoTPi3

index.html

@@ -432,7 +432,7 @@
                     </h3><br></a>
                 </div>
                 <div class="col-md-3 text-center">
-                    <a href="https://codeberg.org/wownero/wowlet/releases">
+                    <a href="https://github.com/wownero/wowlet/releases">
                     <img alt="Wowlet Desktop Wallet" src="img/Wownero_Arcade_Illustration_Asset.svg" height="128px" class=""/><br><br>
                     <h3 id="wowlet">
                         Wowlet Desktop Wallet