Initial preview work

# .github/workflows/preview.yml

name: Deploy PR previews

on:

  pull_request:

    types:

      - opened

      - reopened

      - synchronize

      - closed

concurrency: preview-${{ github.ref }}

jobs:

  deploy-preview:

    runs-on: ubuntu-24.04

    steps:

      - name: Checkout

        uses: actions/checkout@v3

      #TODO: build the site, actually

      - name: Deploy preview

        uses: rossjrw/pr-preview-action@v1

        with:

          source-dir: ./web/