message: Update twitter user name and links
diff: <!-- TWITTER CARD -->
  <meta name="twitter:card" content="summary_large_image" />
  - <meta name="twitter:site" content="@web_dev_david" />
  - <meta name="twitter:creator" content="@web_dev_david" />
  + <meta name="twitter:site" content="@david_cetinkaya" />
  + <meta name="twitter:creator" content="@david_cetinkaya" />
  <meta
  name="twitter:title"
  content="Embla - Simple & sensible carousels for the web"
  >,
  <a
  class="styled-link"
  - href="https://twitter.com/web_dev_david"
  + href="https://twitter.com/david_cetinkaya"
  target="_blank"
  >Twitter</a
  >.
  