Fixed #29 -- "Shop is live" flag

src/static/pretixcontrol/less/main.less

@@ -112,3 +112,19 @@ nav.navbar {
         font-size: 20px;
     }
 }
+.dashboard .shopstate {
+    text-align: center;
+    padding: 36px 0;
+
+    span.live, span.off {
+        display: block;
+        font-size: 20px;
+        padding: 10px 0;
+    }
+    span.live {
+        color: @brand-success;
+    }
+    span.off {
+        color: @brand-danger;
+    }
+}

src/static/pretixpresale/less/event.less

@@ -79,6 +79,18 @@
 .checkout-button-row {
     padding: 15px 0;
 }
+.offline-banner {
+    background: @brand-danger;
+    color: white;
+    width: 100%;
+    padding: 5px;
+    text-align: center;
+
+    a {
+        text-decoration: underline;
+        color: white;
+    }
+}
 @media (max-width: @screen-sm-max) {
     .checkout-button-row div {
         margin-bottom: 10px;