Adds DOCX and Markdown export functionality

Introduces a modular exporter pattern supporting DOCX and Markdown formats
by implementing Exporter interfaces and restructuring application logic.

Enhances CI to install UPX for binary compression, excluding recent macOS
binaries due to compatibility issues.

Enables CGO when building binaries for all platforms, addressing potential
cross-platform compatibility concerns.

Bumps version to 0.1.1.

.github/workflows/ci.yml

@@ -105,6 +105,11 @@ jobs:
       - name: Run tests
         run: go test -v ./...
 
+      - name: Install UPX
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y upx
+
       - name: Build binaries
         run: |
           # Set the build time environment variable
@@ -121,6 +126,32 @@ jobs:
             --verbose \
             -ldflags "-s -w -X github.com/kjanat/articulate-parser/internal/version.Version=${{ github.ref_name }} -X github.com/kjanat/articulate-parser/internal/version.BuildTime=$BUILD_TIME -X github.com/kjanat/articulate-parser/internal/version.GitCommit=${{ github.sha }}"
 
+      - name: Compress binaries with UPX
+        run: |
+          echo "Compressing binaries with UPX..."
+          cd build/
+          
+          # Get original sizes
+          echo "Original sizes:"
+          ls -lah
+          echo ""
+          
+          # Compress all binaries except Darwin (macOS) binaries as UPX doesn't work well with recent macOS versions
+          for binary in articulate-parser-*; do
+            if [[ "$binary" == *"darwin"* ]]; then
+              echo "Skipping UPX compression for $binary (macOS compatibility)"
+            else
+              echo "Compressing $binary..."
+              upx --best --lzma "$binary" || {
+                echo "Warning: UPX compression failed for $binary, keeping original"
+              }
+            fi
+          done
+          
+          echo ""
+          echo "Final sizes:"
+          ls -lah
+
       - name: Upload a Build Artifact
         uses: actions/upload-artifact@v4.6.2
         with: