[listings] Drop Next 12 version to align with #5

This drops the older Next 12.x version. It's primary deltas to the current more up to date version are that it features authentication and more features.

index.html

@@ -310,9 +310,6 @@ <h2 class="center">A non-trivial Movies app built in multiple frameworks</h2>
                         <a target="_blank" target="_blank" href="https://movies-flax-sigma.vercel.app/"
                             class="demo-btn">Demo</a>
                         <a target="_blank" href="https://github.com/tastejs/next-movies" class="source-btn">Source</a>
-                        <div style="display:block; font-size:0.8em; color:black; margin-top: 8px;">Next 12 <a
-                                href="https://next-movies-zeta.vercel.app/">demo</a> and <a
-                                href="https://github.com/oktay/movies">source</a></div>
                     </div>
 
                 </div>