Refactor and modernize Exporter package:

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+
+# GitHub Pages (nur deploy-pages-Job)
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.3', '8.4']
+
+    name: PHPUnit (PHP ${{ matrix.php }})
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, mbstring, xml, zip
+          coverage: none
+
+      - name: Install Composer dependencies
+        run: composer update --prefer-dist --no-interaction --no-progress
+
+      - name: Run PHPUnit
+        run: vendor/bin/phpunit
+
+  docs:
+    runs-on: ubuntu-latest
+    name: MkDocs build
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install MkDocs
+        run: pip install -r docs/requirements.txt
+
+      - name: Build documentation
+        env:
+          NO_MKDOCS_2_WARNING: '1'
+        run: mkdocs build --strict
+
+      - name: Upload Pages artifact
+        if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')
+        uses: actions/upload-pages-artifact@v4
+        with:
+          path: site
+
+  deploy-pages:
+    if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')
+    needs: docs
+    runs-on: ubuntu-latest
+    name: Deploy to GitHub Pages
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

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+site/
+/vendor/
+/.phpunit.cache/

.readthedocs.yaml

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+# Read the Docs configuration
+# https://docs.readthedocs.io/en/stable/config-file/v2.html
+
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+
+mkdocs:
+  configuration: packages/Exporter/mkdocs.yml
+
+python:
+  install:
+    - requirements: packages/Exporter/docs/requirements.txt