Remove unused bukkit.yml options and update links / info.

By: md_5 <git@md-5.net>

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -553,10 +553,6 @@ public final class CraftServer implements Server {
         return new File((File) console.options.valueOf("plugins"), this.configuration.getString("settings.update-folder", "update"));
     }
 
-    public int getPingPacketLimit() {
-        return this.configuration.getInt("settings.ping-packet-limit", 100);
-    }
-
     @Override
     public long getConnectionThrottle() {
         return this.configuration.getInt("settings.connection-throttle");