Clean up index.html

Author: ibelem

_layouts/webnn-samples.html

@@ -33,10 +33,10 @@ <h2 class="title">WebNN Samples</h2>
           <div id="bg_nnotepad" class="cardwrapper">
             <div class="data">
               <div class="content">
-                <h1 class="title"><a href="https://webmachinelearning.github.io/webnn-samples/nnotepad/index.html">NNotepad - WebNN Playground</a></h1>
+                <h1 class="title"><a href="https://webmachinelearning.github.io/webnn-samples/nnotepad/">NNotepad - WebNN Playground</a></h1>
                 <p class="text">A browser-based playground for experimenting with WebNN expressions without boilerplate code.</p>
                 <div class="samplelink">
-                  <a href="https://webmachinelearning.github.io/webnn-samples/nnotepad/index.html">
+                  <a href="https://webmachinelearning.github.io/webnn-samples/nnotepad/">
                     Explore
                     <svg fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"
                       stroke-width="2" class="link" viewBox="0 0 24 24">