feat(#56): add a slot content on the youtube slide

Author: peterpeterparker

webcomponents/core/src/components/slides/deckdeckgo-slide-youtube/deckdeckgo-slide-youtube.tsx

@@ -155,6 +155,7 @@ export class DeckdeckgoSlideYoutube implements DeckdeckgoSlide {
   render() {
     return <div class="deckgo-slide">
       <slot name="title"></slot>
+      <slot name="content"></slot>
       <div class="deckgo-youtube-container">
         {this.renderVideo()}
       </div>

webcomponents/core/src/index.html

@@ -50,6 +50,7 @@ <h2 slot="footer" style="--background: white; --color: blue;">Cool?</h2>
 
   <deckgo-slide-youtube src="https://www.youtube.com/watch?v=oUOjJIfPIjw">
     <h1 slot="title">A 16/9 video</h1>
+    <h2 slot="content">A subtitle or something about the video</h2>
   </deckgo-slide-youtube>
 
   <deckgo-slide-content reveal="true">