Add Lui's fansite to the Link Archive

[Silverthorn]

13th zone works for me:
http://13thzone.proboards.com/

Well, derp, that one changed it seems. The original url had "proboards54", which was leading to hot garbage. Fixed it now.

LF2 Polish Center also works but you seem to have added it:
https://lf2.pl/

Yeap

Here's another that should probably be listed:

LF2 Lobby: http://www.lf2lobby.com

Added! Also, while I was at it, LF Replays is now included as well.

Thank you for your work!

Cheers!