adjust firestore prompt to be more succinct

[charlotteliang]

• Remove redundant security rule clarification now that we have security rule example shown below
• Add clarification to prevent users manually create database on the console
• Add clarification to ask gemini to explain to users about security rules before deploying them
• Clarify schema terminology and show users the app schema by default.

[gemini-code-assist]

Summary of Changes

Hello @charlotteliang, 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 refines the Firestore initialization prompt to be more succinct and user-friendly. It focuses on improving the clarity of instructions for database setup, deployment, and security rule handling, ensuring users are guided effectively without unnecessary details or potential missteps like manual console database creation.

Highlights

• Prompt Conciseness: Removed redundant security rule clarification, streamlining the Firestore setup prompt.
• Database Creation Guidance: Added clarification to prevent users from manually creating databases on the console, guiding them to use firebase deploy instead.
• Security Rules Explanation: Included a new instruction to ask Gemini to explain security rules to users and obtain confirmation before deploying them.

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[gemini-code-assist]

Code Review

This pull request refactors the Firestore initialization guide to be more succinct and direct. The changes remove redundant sections and clarify instructions for the AI agent. My review includes a couple of suggestions to improve the grammar and clarity of the instructions to ensure they are interpreted correctly by the agent.

[joehan]

Some small nits, but seems fine to me - lets get Sam's review on this too since he's been editting the prompt more actively than I have been.

[charlotteliang]

Added fixes based on the review

[samedson]

This looks good - I think you'll just need to rebase and include the changes from https://github.com/firebase/firebase-tools/pull/9218/files