Consolidate gateway-gamers sites, dedupe shared header/footer/images

Merge the four independent gateway-gamers.net site repos (40k-rankings,
aos-rankings, kingmaker, scouting) into one monorepo under sites/,
preserving each site's full commit history via a manual subtree-style
merge (git-subtree isn't available in this environment).

- shared/: header.template.html (nav swapped in per site), footer.html,
  and images/ — previously byte-identical copies duplicated 4x (~100MB).
- Each site's public/footer.html and public/images are now symlinks into
  shared/; public/header.html is generated at predev/prebuild time from
  shared/header.template.html + the site's own nav.html, so nav bars stay
  individual while everything else about the header is shared.
- Single root .gitlab-ci.yml with path-scoped build/deploy jobs per site
  plus a deploy:shared job, replacing the 4 separate per-repo pipelines.
- nginx confs (kept per-site as reference, same as before) gain
  location /images/ and location = /footer.html alias blocks pointing at
  a shared webserver directory, so the deployed site no longer duplicates
  the images either — see README.md for the full layout and the runbook
  for applying this on the webserver.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SBzcNkW7JcYipnAX6HfgmK

.gitlab-ci.yml

@@ -0,0 +1,178 @@
+stages:
+  - build
+  - deploy
+  - refresh
+
+.build_script: &build_script
+  - cd sites/${SITE}
+  - npm ci
+  - npm run build
+
+# ---------------------------------------------------------------------------
+# shared assets (images + footer.html) — deployed once to a shared dir that
+# every site's nginx server block points at via `alias`, so a photo/logo
+# update only has to land in one place instead of four.
+# ---------------------------------------------------------------------------
+
+deploy:shared:
+  stage: deploy
+  script:
+    - rsync -avz --delete shared/images/ /var/www/domains/gateway-gamers.net/shared/images/
+    - rsync -avz shared/footer.html /var/www/domains/gateway-gamers.net/shared/footer.html
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - shared/**/*
+  environment:
+    name: production/shared
+
+# ---------------------------------------------------------------------------
+# 40k-rankings
+# ---------------------------------------------------------------------------
+
+build:40k-rankings:
+  stage: build
+  variables:
+    SITE: 40k-rankings
+  script: *build_script
+  artifacts:
+    paths:
+      - sites/40k-rankings/dist/
+    expire_in: 1 hour
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/40k-rankings/**/*
+        - shared/**/*
+
+deploy:40k-rankings:
+  stage: deploy
+  needs: ["build:40k-rankings"]
+  script:
+    - rsync -avz --delete --exclude images --exclude footer.html sites/40k-rankings/dist/ /var/www/domains/gateway-gamers.net/40k-rankings/
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/40k-rankings/**/*
+        - shared/**/*
+  environment:
+    name: production
+    url: https://40k-rankings.gateway-gamers.net
+
+refresh-elo:
+  stage: refresh
+  image: python:3.12-slim
+  variables:
+    GIT_STRATEGY: clone
+  script:
+    - cd sites/40k-rankings/statcheck-elo-scraper && python refresh_elo.py && cd ../../..
+    - git config user.email "gitlab-ci@gateway-gamers.net"
+    - git config user.name "GitLab CI"
+    - git remote set-url origin "https://oauth2:${GITLAB_ACCESS_TOKEN}@${CI_SERVER_HOST}/${CI_PROJECT_PATH}.git"
+    - git add sites/40k-rankings/public/elo-data.json
+    - |
+      if ! git diff --cached --quiet; then
+        git commit -m "data: refresh stat-check ELO rankings"
+        git push origin HEAD:main
+      fi
+  only:
+    - schedules
+
+# ---------------------------------------------------------------------------
+# aos-rankings
+# ---------------------------------------------------------------------------
+
+build:aos-rankings:
+  stage: build
+  variables:
+    SITE: aos-rankings
+  script: *build_script
+  artifacts:
+    paths:
+      - sites/aos-rankings/dist/
+    expire_in: 1 hour
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/aos-rankings/**/*
+        - shared/**/*
+
+deploy:aos-rankings:
+  stage: deploy
+  needs: ["build:aos-rankings"]
+  script:
+    - rsync -avz --delete --exclude images --exclude footer.html sites/aos-rankings/dist/ /var/www/domains/gateway-gamers.net/aos-rankings/
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/aos-rankings/**/*
+        - shared/**/*
+  environment:
+    name: production
+    url: https://aos-rankings.gateway-gamers.net
+
+# ---------------------------------------------------------------------------
+# kingmaker
+# ---------------------------------------------------------------------------
+
+build:kingmaker:
+  stage: build
+  variables:
+    SITE: kingmaker
+  script: *build_script
+  artifacts:
+    paths:
+      - sites/kingmaker/dist/
+    expire_in: 1 hour
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/kingmaker/**/*
+        - shared/**/*
+
+deploy:kingmaker:
+  stage: deploy
+  needs: ["build:kingmaker"]
+  script:
+    - rsync -avz --delete --exclude images --exclude footer.html sites/kingmaker/dist/ /var/www/domains/gateway-gamers.net/kingmaker/
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/kingmaker/**/*
+        - shared/**/*
+  environment:
+    name: production
+    url: https://kingmaker.gateway-gamers.net
+
+# ---------------------------------------------------------------------------
+# scouting
+# ---------------------------------------------------------------------------
+
+build:scouting:
+  stage: build
+  variables:
+    SITE: scouting
+  script: *build_script
+  artifacts:
+    paths:
+      - sites/scouting/dist/
+    expire_in: 1 hour
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/scouting/**/*
+        - shared/**/*
+
+deploy:scouting:
+  stage: deploy
+  needs: ["build:scouting"]
+  script:
+    - rsync -avz --delete --exclude images --exclude footer.html sites/scouting/dist/ /var/www/domains/gateway-gamers.net/scouting/
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'
+      changes:
+        - sites/scouting/**/*
+        - shared/**/*
+  environment:
+    name: production
+    url: https://scouting.gateway-gamers.net