Incorrect Twemoji CDN

[msipavicius]

Recently I have experienced failures while generating PDFs with emojis. As per https://github.com/twitter/twemoji/issues/580 MaxCDN is no longer accessible. Examples in the documentation should be changed to

Font.registerEmojiSource({
  format: "png",
  url: "https://cdn.jsdelivr.net/gh/twitter/twemoji@latest/assets/72x72/",
});