Fix links to tools on index page

www-zola/templates/index.html

@@ -2,13 +2,13 @@
 
 {% block content %}
 <div class="grid">
-   <article><a href="decode.html">Decode a PSSH box</a></article>
-   <article><a href="generate.html">Generate a Widevine PSSH</a></article>
-   <article><a href="fetch-init.html">Fetch an initialization segment and decode any PSSH data</a></article>
+   <article><a href="decode/">Decode a PSSH box</a></article>
+   <article><a href="generate/">Generate a Widevine PSSH</a></article>
+   <article><a href="fetch-init/">Fetch an initialization segment and decode any PSSH data</a></article>
 </div>
 
-<p>These tools are all implemented in WebAssembly and run directly in your browser. There is no server
-backend; the tools will run offline if you've loaded the page. All the content is hosted on
-<a href="https://pages.github.com/">GitHub pages</a>. 
+<p>These tools are all implemented in WebAssembly and run directly in your browser. There is no
+server backend; the tools will run offline if you've loaded the page. All the content is hosted on
+<a href="https://pages.github.com/">GitHub pages</a>.
 
 {% endblock content %}