Add webapp to docs

Author: samuelstevens

docs/index.html

@@ -28,6 +28,11 @@ <h1>Saev</h1>
     <p>
       <a href="https://github.com/samuelstevens/saev/blob/main/logbook.md">My logbook</a> is a set of notes that might also be useful.
     </p>
+    <p>
+      I am working on some web apps so anyone can play with SAEs for vision without needing to run any code themselves.
+      The first of these web apps is <a href="webapps/classification">here</a>.
+      Please don't share it publicly yet.
+    </p>
     <h2>Package Docs</h2>
     <dl id="http-server-module-list">
       <div class="flex">