feat(welcome): message de bienvenue avec les mentions du jeu

Le message de premier lancement (registerTours, désormais appelé au hook
ready — il ne l'était jamais) inclut les crédits : VERMINE 2047, un jeu
de Julien Blondel — © 2023 Studio Agate — TOTEM System — © 2023 Julien
Blondel, et le système Foundry développé par LeRatierBretonnier
(https://www.uberwald.me) sur un travail original de RWanoux. Style
.vermine-credits ajouté.

lang/en.json

@@ -69,7 +69,7 @@
     "roll_dice": "Roll the dice"
   },
   "TOURS": {
-    "ChatMessage": "<h3>Welcome to Vermine!</h3><p>If you're using this system for the first time, our shaman will guide you to your initiation rite</p> <button id=\"vermine-tour-chat-button\"> <i class=\"fas fa-person-hiking\"></i> I'm going but I'm scared </button>",
+    "ChatMessage": "<h3>Welcome to Vermine 2047!</h3><p>If you're using this system for the first time, our shaman will guide you to your initiation rite</p> <button id=\"vermine-tour-chat-button\"> <i class=\"fas fa-person-hiking\"></i> I'm going but I'm scared </button><hr><p class=\"vermine-credits\"><strong>Vermine 2047</strong> — a game by Julien Blondel<br>© 2023 Studio Agate — TOTEM System — © 2023 Julien Blondel — All rights reserved.<br>Foundry VTT system developed by <a href=\"https://www.uberwald.me\">LeRatierBretonnier</a>, based on an original work by RWanoux.</p>",
     "Welcome": {
       "Title": "Welcome to Vermine",
       "Description": "Overview of the Vermine system",