Changes in chat environment and removing .env files and readme_hf files

.gitignore

@@ -19,5 +19,6 @@ Thumbs.db
 .gradio/
 
 # Specific files to ignore
-README.md
+README_HF.md
 requirement.txt
+.env_example

src/docling_chat.py

@@ -1,18 +1,29 @@
 import openai
 import os
 
+# Load API key from environment variable
 openai.api_key = os.getenv("OPENAI_API_KEY")
 
+# Check if API key is available and print a message if not
+if not openai.api_key:
+    print("Warning: OPENAI_API_KEY environment variable not found. Chat functionality may not work.")
+
 def chat_with_document(message, history, document_text_state):
     history = history or []
     history.append({"role": "user", "content": message})
 
     context = f"Document: {document_text_state}\n\nUser: {message}"
 
-    response = openai.chat.completions.create(
-        model="gpt-4o-2024-08-06",
-        messages=[{"role": "system", "content": context}] + history
-    )
-    reply = response.choices[0].message.content
+    # Add error handling for API calls
+    try:
+        response = openai.chat.completions.create(
+            model="gpt-4o-2024-08-06",
+            messages=[{"role": "system", "content": context}] + history
+        )
+        reply = response.choices[0].message.content
+    except Exception as e:
+        reply = f"Error: Could not generate response. Please check your OpenAI API key. Details: {str(e)}"
+        print(f"OpenAI API error: {str(e)}")
+    
     history.append({"role": "assistant", "content": reply})
     return history, history