[web-animations-1] Don't generate MDN panels for now

Due to speced/bikeshed#2045

Author: birtles

web-animations-1/Overview.bs

@@ -112,6 +112,7 @@ Abstract: This specification defines a model for synchronization and
 Ignored Terms: double, boolean, DOMString, unsigned long, unrestricted double, (unrestricted double or DOMString)
 Link Defaults: css-transforms (property) transform
 Markup Shorthands: markdown yes
+Include Mdn Panels: no
 </pre>
 <pre class="anchors">
 urlPrefix: https://heycam.github.io/webidl/#dfn-; type: dfn; spec: webidl