docs: Enhance example/chatbot with added instructions (#3506)

# Description

Instructions in README of example/chatbot is a little out-dated. Updated
it to match the latest codebase.

## Checklist before requesting a review

Please delete options that are not relevant.

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented hard-to-understand areas
- [x] I have ideally added tests that prove my fix is effective or that
my feature works


## Screenshots (if appropriate):

NA

core/quivr_core/rag/entities/config.py

@@ -230,6 +230,7 @@ def set_api_key(self, force_reset: bool = False):
 
         if not self.llm_api_key:
             logger.warning(f"The API key for supplier '{self.supplier}' is not set. ")
+            logger.warning(f"Please set the environment variable: '{self.env_variable_name}'. ")
 
     def set_llm_model_config(self):
         # Automatically set context_length and tokenizer_hub based on the supplier and model

examples/chatbot/README.md

@@ -8,23 +8,32 @@ This example demonstrates how to create a simple chatbot using Quivr and Chainli
 
 ## Installation
 
-1. Clone the repository or navigate to the `core/examples/chatbot` directory.
+1. Clone the repository and navigate to the `examples/chatbot` directory.
 
-2. Install the required dependencies:
+2. Make sure you have [rye](https://rye.astral.sh/) installed.
 
+3. Install the requirements using `rye`:
+
+   ```sh
+   rye sync
    ```
-   pip install -r requirements.lock
+4. Activate the venv
+
+   ```sh
+   source ./venv/bin/activate
    ```
 
 ## Running the Chatbot
 
-1. Start the Chainlit server:
+1. Define your API key as environment variable. e.g. `export OPENAI_API_KEY=your-key-here`
+
+2. Start the Chainlit server:
 
    ```
    chainlit run main.py
    ```
 
-2. Open your web browser and go to the URL displayed in the terminal (usually `http://localhost:8000`).
+3. Open your web browser and go to the URL displayed in the terminal (usually `http://localhost:8000`).
 
 ## Using the Chatbot