Set max page limit as a constant

app.py

@@ -504,7 +504,7 @@ def generate_slide_deck(json_str: str) -> Union[pathlib.Path, None]:
 
 def get_pdf_contents(
         pdf_file: st.runtime.uploaded_file_manager.UploadedFile,
-        max_pages: int = 20
+        max_pages: int = GlobalConfig.MAX_PAGE_COUNT
 ) -> str:
     """
     Extract the text contents from a PDF file.

global_config.py

@@ -86,6 +86,7 @@ class GlobalConfig:
     LLM_MODEL_TEMPERATURE = 0.2
     LLM_MODEL_MIN_OUTPUT_LENGTH = 100
     LLM_MODEL_MAX_INPUT_LENGTH = 400  # characters
+    MAX_PAGE_COUNT = 50
 
     LOG_LEVEL = 'DEBUG'
     COUNT_TOKENS = False