fix(splash, pages.yml): deploy from rebuild/turbo-rsbuild, the repo's default branch

GitHub Pages never built because the workflow only triggered on push to `main` — but augment-it's default branch, and the only branch that has splash/, is `rebuild/turbo-rsbuild`. Add it to the push triggers so pushes to it build + deploy (main kept for after the rebuild lands there). Pushing this commit is itself the first triggering push.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: mpstaton

.github/workflows/pages.yml

@@ -2,7 +2,11 @@ name: Deploy splash to GitHub Pages
 
 on:
   push:
-    branches: [main]
+    # The augment-it rebuild currently lives on `rebuild/turbo-rsbuild` — that's
+    # where splash/ exists, so that's what we deploy from. `main` is kept for
+    # after the rebuild lands there. (master/development are intentionally NOT
+    # watched yet: they have no splash/, so a push would just fail the build.)
+    branches: [rebuild/turbo-rsbuild, main]
   workflow_dispatch:
 
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