rename to 40k-rankings.gateway-gamers.net

Update deploy path, environment URL, nginx conf, and package name
to reflect the new subdomain.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitlab-ci.yml

@@ -17,9 +17,9 @@ build:
 deploy:
   stage: deploy
   script:
-    - rsync -avz --delete dist/ /var/www/domains/gateway-gamers.net/rankings/
+    - rsync -avz --delete dist/ /var/www/domains/gateway-gamers.net/40k-rankings/
   only:
     - main
   environment:
     name: production
-    url: https://rankings.gateway-gamers.net
+    url: https://40k-rankings.gateway-gamers.net