update leaflet to 1.7.1
Also switches CDN to the one recommenden by Leaflet.
<head>
<meta charset="utf-8">
<title>Photon, search-as-you-type with OpenStreetMap</title>
- <link rel="stylesheet" href="//cdn.jsdelivr.net/leaflet/0.7.3/leaflet.css"/>
+ <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"/>
<link rel="stylesheet" href="static/leaflet.photon/leaflet.photon.css">
<link rel="stylesheet" href="static/css/app.css">
<link rel="icon" href="static/img/favicon_photon_logo.ico">
<footer>
An OpenStreetMap project run by <a href="http://www.komoot.de">komoot</a>
</footer>
-<script src="//cdn.jsdelivr.net/leaflet/0.7.3/leaflet.js"></script>
+<script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script>
<script src="static/leaflet.photon/leaflet.photon.js"></script>
<script src="config.js"></script>
<script src="static/js/app.js"></script>
