TEST: add unit tests for admonition styles

Add pytest suite covering admonition CSS rules introduced in this PR:
- CSS coverage: all 26 admonition types present in source and minified files
- Icon validation: correct Font Awesome 4.7 codepoints per type
- Color validation: Dracula CSS variables used (no hardcoded hex)
- Minified format: single-line, no comments, shorthand values

Refs #29

Author: FernandoCelmer

.github/workflows/test.yml

@@ -0,0 +1,34 @@
+name: ❤️ Tests
+
+on:
+  pull_request:
+    branches: ["main", "master", "develop"]
+  push:
+    branches: ["main", "master", "develop"]
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+
+    steps:
+      - name: 📥 Checkout code
+        uses: actions/checkout@v4
+
+      - name: 🐍 Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: ⚙️ Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install poetry
+          poetry install
+
+      - name: ❤️ Run tests
+        run: poetry run pytest --tb=short -v