Delete preview.yml

.github/workflows/preview.yml

-name: Build and deploy preview
-
-on:
-  push:
-    branches:
-      - main
-      - dev-gh
-
-env:
-  NODE: 14
-
-jobs:
-  github-pages:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Clone repository
-        uses: actions/checkout@v2
-
-      - name: Set up Node.js
-        uses: actions/setup-node@v2
-        with:
-          node-version: "${{ env.NODE }}"
-          cache: npm
-
-      - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 2.6
-          bundler-cache: true
-
-      - run: ruby --version
-      - run: node --version
-
-      - name: Install npm dependencies
-        run: npm ci
-
-      - name: Build preview
-        run: npm run preview
-
-      - name: Sync files
-        uses: SamKirkland/FTP-Deploy-Action@4.1.0
-        with:
-          server: ${{ secrets.PREVIEW_HOST }}
-          username: ${{ secrets.PREVIEW_USER }}
-          password: ${{ secrets.PREVIEW_PASSWORD }}
-          local-dir: ./demo/