Adds template for the promo section of the website.
Merge branch 'master' of github.com:site-3/design

* 'master' of github.com:site-3/design:
  HTTP link for Site 3, HTTPS link didn't work.
  Readmes for all class flyers.
  Trying out a readme for the class flyers.
  Adds note to readme about what this is and who to send assets to.
  Adds a version of Lindy's logo with a thicker inside stroke for use in smaller sizes.
  Adds Lindy's logo assets.
  Replaces old asset that was not actually printed.
  Desgin tweaks and fixes incorrect class date.