chore(ci, cd): build and deploy via _gh-actions_ directly

New actions available in GitHub allow for building and deploying the site
completely from the actions workflow with minimal code.
The deploy.sh script is no longer necessary with these changes.

.github/workflows/ci.yml

@@ -20,18 +20,22 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+
     strategy:
       matrix:
         ruby: [2.5, 2.6, 2.7, 3]
+
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0  # for posts's lastmod
+
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
+
       - name: Test Site
-        run: bash tools/deploy.sh --dry-run
+        run: bash tools/test.sh