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
diff --git a/concerts/ciba2021.json b/concerts/ciba2021.json
index b4af5d8..5d89788 100644
--- a/concerts/ciba2021.json
+++ b/concerts/ciba2021.json
@@ -1,4 +1,5 @@
 {
+  "codename": "ciba2021",
   "title": "Dones de Musicaula en concert",
   "subtitle": "La Ciba - 7 de març del 2021",
   "begins": 1615137300,