docs: simplify README config instructions (Closes #500)

[magnet78]

Closes #500

Simplified the config setup instructions to be more beginner-friendly by suggesting to copy the entire development config file instead of overriding from two separate files.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 35b60249-8b6a-494c-bf6d-1368c5ec14b2

📥 Commits

Reviewing files that changed from the base of the PR and between 0552516 and d07c540.

📒 Files selected for processing (1)

• README.md

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Summary by CodeRabbit

• Documentation
  • Updated prerequisites documentation with streamlined instructions for local configuration setup.

Walkthrough

The README's configuration setup instructions for local development are simplified. The prerequisite now instructs copying config/development.js to config/local.js and updating clientId and clientSecret fields, replacing prior guidance about overriding values from multiple config files.

Changes

README Setup Instructions

Layer / File(s)	Summary
Configuration setup guidance README.md	The instruction for creating config/local.js shifts from "override required values from config/development.js and config/default.js" to "copy config/development.js and set clientId and clientSecret" for improved clarity and beginner-friendliness.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A README so clear, no confusion in sight,
Copy and paste, then update fields right,
Config simplified, the setup's now bright,
Beginners rejoice—it's easier tonight! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR partially addresses the linked issue #500 by simplifying the config instructions, but does not address the second objective about clarifying GitHub OAuth registration instructions.	Verify if the README changes also include clarifications for GitHub OAuth registration instructions (callback URL format), or update the PR to complete the second part of issue #500.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: simplifying README config instructions, which directly matches the file summary showing updated prerequisite guidance.
Description check	✅ Passed	The description is related to the changeset, explaining that config setup instructions were simplified to be more beginner-friendly by suggesting to copy the development config file.
Out of Scope Changes check	✅ Passed	All changes are directly related to simplifying README config instructions, which aligns with the scope of issue #500.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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