ci: add workflow for publishing help

.github/workflows/help.publish.yml

@@ -0,0 +1,35 @@
+name: Publish Notesnook Help
+
+on: 
+  workflow_dispatch:
+  push:
+    branches:
+      - "master"
+    paths:
+      - "docs/help/**"
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Install docgen
+        run: cargo install --git https://github.com/thecodrr/docgen
+
+      - name: Build site
+        run: docgen build --release
+        working-directory: docs/help
+
+      - name: Setup environment
+        run: |
+          echo "CLOUDFLARE_ACCOUNT_ID=${{ secrets.CLOUDFLARE_ACCOUNT_ID }}" >> $GITHUB_ENV
+          echo "CLOUDFLARE_API_TOKEN=${{ secrets.CLOUDFLARE_API_TOKEN }}" >> $GITHUB_ENV
+
+      - name: Publish on Cloudflare Pages
+        run: npx --yes wrangler pages deploy --project-name notesnook-help ./docs/help/site/ --branch main