Fix duplicate code in RAG page

[mrmer1]

This PR removes the following lines of code:

response = co.chat_stream(
    model="command-r-plus-08-2024",
    messages=messages,
    documents=documents,
    citation_options={"mode":"accurate"}
)

messages = [{"role": "user", "content": "Where do the tallest penguins live?"}]

Summary

The PR removes the code that sets the response variable to the result of the co.chat_stream function. This function is used to generate a response to a user's message, and the removed code sets the model, messages, documents, and citation options for the function.

Changes

• The response variable is no longer set to the result of the co.chat_stream function.
• The messages variable is no longer set to a list containing a user message.

[github-actions]

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