Docs: Update Remote Config instructions

[AndreSand]

The setup instructions in the README are updated to reflect the process of uploading a JSON file for Firebase Remote Config.

Transformed the file remote_config_defaults.xml to json format remote_config_defaults.json. This new file is added to establish default settings for the application's remote config feature flags and prompts.

Fyi: Wrote a medium blog post about the setup with images https://andresand.medium.com/exploring-googles-demo-app-androidify-439149b8750c

[gemini-code-assist]

Summary of Changes

Hello @AndreSand, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the Firebase Remote Config setup by transitioning from an XML-based configuration to a more modern and manageable JSON format. It updates the documentation to guide users through the new JSON upload process and introduces a comprehensive default JSON file that defines various feature flags and AI-related prompt templates for the application.

Highlights

• Remote Config Instructions Update: The setup instructions in the README.md have been updated to reflect the new process for uploading Firebase Remote Config settings using a JSON file.
• Configuration Format Migration: The application's default Remote Config settings have been migrated from an XML format (remote_config_defaults.xml) to a JSON format (remote_config_defaults.json).
• New Default Remote Config File: A new file, setup/remote_config_defaults.json, has been added to establish default settings for the application's feature flags and AI prompt configurations.

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[gemini-code-assist]

Code Review

This pull request updates the Firebase Remote Config setup instructions by introducing a JSON template file. This is a great change that simplifies the setup process. My review includes a few suggestions for the README.md file to improve the clarity and accuracy of the new instructions, ensuring developers can follow them without confusion. Specifically, I've pointed out a contradictory statement and some outdated UI references in the Firebase Console steps.

[riggaroo]

thanks!