chore: add surge preview

.github/preview.yml

@@ -0,0 +1,17 @@
+name: 🔂 Surge PR Preview
+
+on: [push, pull_request_target]
+
+jobs:
+  preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: afc163/surge-preview@v1
+        with:
+          surge_token: ${{ secrets.SURGE_TOKEN }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          build: |
+            yarn --frozen-lockfile
+            yarn site:build
+          dist: public