Show current queue (closes #23)

commit 77d9068b8ced163d89d280f0e4ea40f3a55a831d
Author: Arne Schlüter <arne@schlueter.is>
Date:   Mon Oct 8 23:49:49 2018 +0200

    Mark current track everywhere in app

commit 6243f87b3bdf64b27afeae5007386d4a7fe32fea
Author: Arne Schlüter <arne@schlueter.is>
Date:   Mon Oct 8 23:33:07 2018 +0200

    s/currently playing/current queue/, move link to own button and add about page

commit 1dfb00b0623f64ae32953f112192894008c6adc9
Author: Arne Schlüter <arne@schlueter.is>
Date:   Mon Oct 8 22:32:11 2018 +0200

    Implement simple "currently playing" page

commit a2fef45a8a8989e1d176d859c875d994982f7329
Author: Arne Schlüter <arne@schlueter.is>
Date:   Mon Oct 8 22:00:37 2018 +0200

    Hide unimplemented / incomplete features from navbar and add 404 page

src/sass/app.sass

@@ -48,25 +48,25 @@
     .level-right
       display: flex
 
-      .buttons-start,
-      .buttons-end
+      .button-group
         margin: 0 .5rem
 
+        + .button-group
+          margin-left: 0
+
       =tablet
         flex-grow: 0
         flex-shrink: 1
         padding-left: .5rem
         padding-right: .5rem
 
-        .buttons-start
-          margin-left: .75rem
-
   .media
     flex-grow: 1
     align-items: center
 
-  progress
-    width: 100%
+  .current-song-info
+    progress
+      width: 100%
 
 .progress.is-tiny
   height: .25rem
@@ -100,6 +100,11 @@
   .grow
     width: 100%
 
+// duh
+.song-list
+  .song.is-playing
+    background-color: $light !important
+
 // floating notifications
 .notifications:not(:empty)
   @extend .container