Update Shrine README

[cy245]

Remove mentions of glitch.me and provide general overview of the app design.

[gemini-code-assist]

Summary of Changes

Hello @cy245, 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 primarily updates the Shrine/README.md file to enhance its accuracy and utility. The changes involve removing obsolete information related to glitch.me server configurations and introducing a detailed overview of the application's design and architecture. The goal is to provide a more relevant and helpful guide for understanding the Shrine sample app's structure and its current user interaction flows.

Highlights

• README Refactor: The Shrine/README.md file has undergone a significant refactor to improve clarity and provide a more current overview of the application.
• Glitch.me Backend Removal: All outdated references and setup instructions for using glitch.me as a backend server have been completely removed from the documentation.
• App Design Overview Added: A new 'Design' section has been introduced, offering a high-level explanation of the app's architecture, including its server integration, component responsibilities (Screens, View Models, Credential Manager), and data flow.
• Updated User Flow: The 'Typical account creation and login flow' section has been revised to reflect current features such as passkey-only account creation, Sign in with Google, and passkey management, simplifying the user journey descriptions.

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[gemini-code-assist]

Code Review

This pull request updates the Shrine README to remove mentions of glitch.me and provide a general overview of the app design. The changes include renaming the app title, updating the features list, revising the account creation and login flow, and adding a design section that covers the app's architecture, server, screens, view models, credential manager, and requests/responses. I have provided a review comment to address a potential issue.