fix: drop SRI on lazysizes (assets.ubuntu.com lacks CORS)

Author: Skazitron

templates/base_index.html

@@ -108,8 +108,6 @@
                 crossorigin />
 
           <script src="https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.js"
-                  integrity="sha384-TI/T2gDQjjlI4xuVcADfKuha0uICGVNowMXFblCWGz6MMkwVNIEuc59dlu6rQuNE"
-                  crossorigin="anonymous"
                   defer></script>
 
           <link rel="stylesheet" type="text/css" media="screen" href="{{ versioned_static("css/styles.css") }}" />