fix: pdfs directory for url

app.py

@@ -155,7 +155,7 @@ def add_certified_user(hf_username, first_name, last_name, certificate_type):
     if not check.empty:
         history = history.drop(labels=check.index[0], axis=0)
 
-    pdfs_repo_path = os.path.join("data", "pdfs")
+    pdfs_repo_path = os.path.join("data", "certificates")
 
     # Copy the PDF from its current location to the target directory in the repository
     pdf_repo_filename = f"{hf_username}.pdf"  # Create a specific name for the PDF file