Add per-site READMEs describing what each site serves

Covers pages, data sources, config knobs, files and deploy target for
40k-rankings, aos-rankings, events, kingmaker and scouting. Also lists
events in the root README layout and points to the per-site docs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sites/aos-rankings/README.md

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+# aos-rankings.gateway-gamers.net
+
+A Warhammer Age of Sigmar leaderboard for Gateway Gamers team members, ranked
+by ITC points in an AoS league on Best Coast Pairings (BCP). It's a slimmer
+copy of [40k-rankings](../40k-rankings/README.md), without the Lord Marshal
+Conference and ELO columns.
+
+## What it serves
+
+A single page (`index.html`) with:
+
+- **Team Leader card** showing the top-ranked member's name, ITC points, win
+  rate and global ITC rank.
+- **Stat strip** with players placed, top ITC points, combined team win % and
+  the best league rank held by any member.
+- **Sortable leaderboard**, one row per team member who has placed in the
+  league. Each row shows ITC points, W–L–T record and win % (with career
+  totals underneath) and ITC rank.
+
+The page reads from BCP in the viewer's browser on every load. It caches the
+last result in `localStorage` (`gg_aos_board_v1`) and shows that straight away
+while the live data arrives. The **Refresh** button fetches again.
+
+## Data sources
+
+| Data | Source |
+| --- | --- |
+| Team roster | BCP `teams/{teamId}` |
+| ITC points, rank, record | BCP `placings` for `leagueId`, filtered to `regionId` |
+| Career W–L–T | BCP `placings?userId=…` for each member |
+
+All calls go to `https://newprod-api.bestcoastpairings.com/v1` without
+authentication. Nothing is stored on the server.
+
+## Configuration
+
+Everything you'd normally change is in the `CONFIG` block at the top of
+`src/main.js`:
+
+- `teamId`: the BCP team whose members are shown (the same team as 40k-rankings)
+- `leagueId` / `regionId`: which AoS league and region to rank against
+- `memberIds`: fallback roster, used if the team endpoint ever stops returning
+  members without auth
+- `useSample`: set to `true` to render placeholder rows with no network calls
+
+## Files
+
+- `index.html`, `src/main.js`, `src/style.css`: the page
+- `nav.html`: this site's header nav entries (see the root README)
+- `aos-rankings.gateway-gamers.net.conf`: reference nginx config for the live
+  server block
+
+## Deploy
+
+`.gitea/workflows/deploy-aos-rankings.yml` builds the site and rsyncs `dist/`
+to `/var/www/domains/gateway-gamers.net/aos-rankings/` on every push to `main`
+that touches `sites/aos-rankings/` or `shared/`. See the root README for local
+dev commands and the shared header, footer and images.