feat: automatically start video and scroll to it if clicking timestamp in comments and description (#6111)

Closes https://github.com/iv-org/invidious/issues/627

assets/js/handlers.js

@@ -20,6 +20,12 @@
                 e.preventDefault();
                 var time = t.getAttribute('data-jump-time');
                 player.currentTime(time);
+                // The player_html5_api element is the Video.JS player ID.
+                document.getElementById('player_html5_api').scrollIntoView({
+                  behavior: 'smooth',
+                  block: 'start'
+                });
+                player.play();
                 break;
             case 'get_youtube_replies':
                 var load_more = t.getAttribute('data-load-more') !== null;