ci: bootstrap VitePress deploy workflow (per audit #245)

Author: KooshaPari

.github/workflows/docs-deploy.yml

@@ -0,0 +1,24 @@
+name: Deploy docs
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docs/**'
+      - '.github/workflows/docs-deploy.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    uses: KooshaPari/phenoShared/.github/workflows/reusable/vitepress-pages.yml@main
+    with:
+      concurrency_group: pages-helios-cli
+      docs_dir: docs