pwa missing icons added (#428)

static/index.html

@@ -12,7 +12,7 @@
        in email bodies — was wrapping random digits in <a href="tel:..."> with
        browser-default styling that didn't match the Odysseus theme. -->
   <meta name="format-detection" content="telephone=no, date=no, address=no, email=no">
-  <link rel="apple-touch-icon" href="/static/icon-192.png">
+  <link rel="apple-touch-icon" href="/static/icons/icon-192.png">
   <script nonce="{{CSP_NONCE}}">
   window._odysseusLoadTime = Date.now();
   (function(){