title: How to "manually" (programmatically) insert a block in Gutenberg?
body: <p>Gutenberg's API is quiet obscure and I can't figure how to create and append a block to a post. </p>
  
  <p>I've found the <code>wp.blocks.createBlock('core/paragraph', {content: "blabla"});</code> which returns a pretty block object, but does not append any content to the post.</p>
  
  <p>I would like to insert a simple paragraph with some custom content just by clicking a button.</p>