message: Update meta tag for channel app
diff: -link(rel="canonical" href="#{channel.href()}")
  +link(rel="canonical" href="#{sd.APP_URL}#{channel.href()}")
  link(
  rel='alternate'
  type='application/rss+xml'
  @@ -23,3 +23,4 @@ meta(property="og:url" content="https://www.are.na/#{author.get('slug')}/#{chann
  - description = (channel.has('metadata') && channel.get('metadata').description && channel.get('metadata').description.replace(/(?:\r\n|\r|\n)/g, ' ')) || "Are.na is a social platform for creative and collaborative research."
  meta(name="twitter:description", content=description)
  meta(property="og:description" content=description)
  +meta(name="Description" content=description)
  \ No newline at end of file
  