feat: removes git dates, enforces manual dates, and adds some validation to ensure presence

.github/workflows/validate.yml

@@ -0,0 +1,25 @@
+name: Validate content
+on:
+  push:
+    paths:
+      - 'www/content/**'
+      - 'www/public/*.txt'
+      - 'www/public/config.yaml'
+  pull_request:
+    paths:
+      - 'www/content/**'
+      - 'www/public/*.txt'
+      - 'www/public/config.yaml'
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm validate:www