clean up shortcodes

layouts/shortcodes/vimeo.html

@@ -1,7 +1,12 @@
-<div class="embed {{ .Name }}" style="padding:75% 0 0 0;position:relative;">
-  <iframe src="https://player.vimeo.com/video/{{ .Get "id" }}&amp;dnt=1" style="position:absolute;top:0;left:0;width:100%;height:100%;" frameborder="0" allow="fullscreen" allowfullscreen></iframe>
+<div class="embed {{ .Name }}">
+  <iframe
+    class="vimeo-player"
+    src="https://player.vimeo.com/video/{{ .Get "id" }}&amp;dnt=1"
+    allow="fullscreen"
+    allowfullscreen>
+  </iframe>
 </div>
 
 {{- define "__shortcode_vimeo_js" }}
-<script src="https://player.vimeo.com/api/player.js"></script>
+<script async defer src="https://player.vimeo.com/api/player.js"></script>
 {{ end }}