Add tweak to reduce jank.

Sadly, there is still a bit remaining, but this is a bit less jarring above the fold.

Author: BigBlueHat

playground/next/index.html

@@ -94,7 +94,7 @@ <h2 class="ui massive header">JSON-LD Playground</h2>
     </table>
   </div>
   <!-- main editor area -->
-  <div class="ui compact grid container" :class="[editorColumns]">
+  <div class="ui one column compact grid container" :class="[editorColumns]">
     <div class="column" :class="{ 'sixteen wide':  editorColumns == '' }">
       <div class="ui top attached tabular menu">
         <div :class="{ active: inputTab == 'json-ld' }" class="item" @click="inputTab = 'json-ld'"><i class="pencil alternate icon"></i> JSON-LD Input</div>