www: regen .dockerignore to include v3 files + region-cell assets

`.dockerignore` is an allowlist of git-tracked files generated by
`make-dockerignore.py -G`. The screenshot Docker image (built via
`Dockerfile.screenshots`) only sees files `!`-d back in here. Recently
landed but missing from the allowlist:

- `src/pages/HomeV2.tsx` (3febd3d), `src/pages/CellsDebug.tsx`
  (6b75bf8) — both imported from `src/main.tsx`, so missing them
  caused `pnpm build` in Docker to fail with
  "Could not resolve './pages/HomeV2'" — which broke the screenshot
  step and gated the GH Pages deploy.
- `src/query/ridesV1.ts` (f71499e) — also imported by `HomeV2`.
- `public/assets/region-cells{,-s2}.json` + `stations-regional.json`
  — runtime-fetched assets; not bundled, but the screenshot run
  fetches them at runtime so it needs them in the image.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: ryan-williams

www/.dockerignore

@@ -24,9 +24,12 @@
 !public/assets/dag.json
 !public/assets/gh.png
 !public/assets/index.css
+!public/assets/region-cells-s2.json
+!public/assets/region-cells.json
 !public/assets/s3.png
 !public/assets/station-births.json
 !public/assets/station-urls.json
+!public/assets/stations-regional.json
 !public/assets/twitter.png
 !public/assets/warning.png
 !public/assets/ymrgtb_cd.json
@@ -155,14 +158,17 @@
 !src/index.module.css
 !src/main.tsx
 !src/mdx.d.ts
+!src/pages/CellsDebug.tsx
 !src/pages/Files.tsx
 !src/pages/Health.tsx
 !src/pages/Home.tsx
+!src/pages/HomeV2.tsx
 !src/pages/Pipeline.mdx
 !src/pages/StationDetail.tsx
 !src/pages/Stations.tsx
 !src/query/client.ts
 !src/query/ridesTable.ts
+!src/query/ridesV1.ts
 !src/query/rollups.ts
 !src/query/stations.ts
 !src/stations.module.css