Updates the `docs/brains/gpt4.mdx` documentation to include detailed
instructions on adding a GPT-4 Brain to Quivr and configuring it within
the Supabase integration table.
- Adds a new section titled "Adding GPT-4 Brain to Quivr" that outlines
the steps required to integrate a GPT-4 Brain into Quivr, including
accessing the Supabase dashboard and navigating to the integration
table.
- Provides step-by-step instructions for adding a custom brain named
gpt4 in the Supabase integration table and configuring the necessary
settings for the GPT-4 Brain, such as API keys and preferences.
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For more details, open the [Copilot Workspace
session](https://copilot-workspace.githubnext.com/QuivrHQ/quivr?shareId=81c5fd43-eb46-407c-a40f-c0b0b3a41925).
This pull request updates the documentation and images for the default
brain in Quivr. It includes instructions on how to get started,
customize the brain, and ask questions. Additionally, it adds
documentation for the GPT-4 brain and provides steps on how to interact
with it.