Try simplify input output values.

.github/workflows/main.yml

@@ -35,7 +35,7 @@ jobs:
         with:
           dotnet-version: '8.x'
       - name: Run generator
-        run: dotnet run -c Release --project ./src/generator -- ${{ github.workspace }}/src/books ${{ github.workspace }}/out
+        run: dotnet run -c Release --project ./src/generator -- ./src/books ./out
       - name: Copy static files
         run: cp -r ./src/static/ ./out
       - name: Setup Pages