Add ability to show specific concert via a URL parameter

The |concert| parameter can now be used to show a specific concert.

Change-Id: I85ce519296c8a3d5061021f57391290cd4e16520
5 files changed
tree: 700ad3b822d175e7eca289c342f79f8a13e8ae63
  1. concerts/
  2. css/
  3. img/
  4. js/
  5. tools/
  6. index.html
  7. manifest.json
  8. robots.txt
  9. sw.js