fix output paper path

Author: Nitnelav

.github/workflows/joss-draft-paper.yml

@@ -27,4 +27,4 @@ jobs:
           # This is the output path where Pandoc will write the compiled
           # PDF. Note, this should be the same directory as the input
           # paper.md
-          path: paper.pdf
+          path: paper/paper.pdf