fix workflow and rm pdf

.github/workflows/buildtypst.yml

@@ -10,9 +10,9 @@ jobs:
       - name: Typst
         uses: lvignoli/typst-action@main
         with:
-          source_file: typstalt/main.typ
+          source_file: main.typ
       - name: Upload PDF file
         uses: actions/upload-artifact@v3
         with:
           name: PDF
-          path: typstalt/main.pdf
+          path: main.pdf