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[mkozakov]

This PR updates the fern directory to include a new cookbook, "Build Chatbots That Know Your Business with MongoDB and Cohere." This cookbook showcases how to develop an advanced chatbot assistant that provides asset managers with insights and information from technology company market reports.

To do this, the following changes are made:

• A new file, rag-mongodb-cohere.mdx, is added to the cookbooks directory.
• The fern.config.json file is updated to use version "0.39.19".
• The searchCards array in cookbooks.mdx is modified to include a new object with details about the new cookbook, including its title, description, image source, tags, and href.
• The navigation sections in v1.yml and v2.yml are extended to include a new page entry, pointing to the new cookbook file.
• A new file, rag-mongodb-cohere.json, is added to the scripts/cookbooks-json directory, containing metadata and configuration details for the new cookbook.
• The pages array in download-cookbooks.mjs is modified to include the new cookbook's page path.