[URGENT] [TBR] Restructure concert schema

- Add hasTimes field to concerts in the JSON schema
- Adds begins field to songs in the JSON schema
- Shows these times in the frontend
- Shows a warning message about the concert cancelation and the virtual
  concert planing
- Add CLI tool to get songs by person (tools/list.php)

Change-Id: Iec80ceb69e1a45cd467aaeaa59337a9966c78b7c
diff --git a/css/styles.css b/css/styles.css
index 4de4af8..d34ec10 100644
--- a/css/styles.css
+++ b/css/styles.css
@@ -19,6 +19,7 @@
   padding: 8px 8px;
   background-color: #f3f3f3;
   box-shadow: black 0 -1px 4px;
+  z-index: 100;
 }
 
 .header .header-logo {
@@ -39,6 +40,14 @@
   margin: 74px auto 16px auto;
 }
 
+.hero-message {
+  background: orange;
+  color: black;
+  border-radius: 4px;
+  padding: 16px;
+  margin-bottom: 16px;
+}
+
 .message {
   text-align: center;
 }
@@ -77,6 +86,7 @@
 }
 
 .song {
+  position: relative;
   border: solid 1px gray;
   border-radius: 3px;
   padding: 12px;
@@ -84,6 +94,12 @@
   box-shadow: #bdbdbd 0 1px 3px;
 }
 
+.song .song-time {
+  position: absolute;
+  top: 12px;
+  right: 12px;
+}
+
 .song .song-title {
   margin-top: 0;
   margin-bottom: 4px;