Replace GitLab CI with Gitea Actions workflows

GitLab CE was migrated off to reduce memory pressure on the host, so
.gitlab-ci.yml is dead. Split into one workflow file per site (shared,
40k-rankings, aos-rankings, kingmaker, scouting, events) since Gitea/
GitHub Actions path filters are workflow-level, not job-level like
GitLab's rules.changes. Build+deploy are combined into a single job per
site rather than separate build/deploy stages, since both run on the
same host and there's no need to round-trip artifacts between them.

The weekly ELO refresh job's schedule (Wed 02:00 Atlantic/Azores) is
approximated as a fixed 02:00 UTC cron, since Actions cron has no DST
handling.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/deploy-kingmaker.yml

@@ -0,0 +1,23 @@
+name: Deploy kingmaker
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'sites/kingmaker/**'
+      - 'shared/**'
+  workflow_dispatch:
+
+jobs:
+  build-and-deploy:
+    runs-on: host
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        working-directory: sites/kingmaker
+        run: |
+          npm ci
+          npm run build
+      - name: Deploy
+        run: |
+          rsync -avz --delete --exclude images --exclude footer.html sites/kingmaker/dist/ /var/www/domains/gateway-gamers.net/kingmaker/