docs(action): deploy vercel

.github/workflows/deploy-doc.yaml

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+name: Deploy
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'docs/**'
+jobs:
+  push-to-vercel:
+    name: Push to Vercel
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Use Node.js 12
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - name: Install deps and build (with cache)
+        uses: bahmutov/npm-install@v1
+      - name: Install Vercel CLI
+        run: |
+          npm install -g vercel
+      - name: Deploy to Vercel
+        env:
+          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
+          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+        run: |
+          vercel --prod --token="$VERCEL_TOKEN" -f

docs/vercel.json

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+{
+  "project": "orval"
+}