docs: consolidate README prerequisites and normalize section order

[MEECHAIN1]

Motivation

• Simplify onboarding by reducing duplicate sections and presenting a single, clear ## Prerequisites with non-redundant dependencies.
• Ensure local server examples are consistent and unambiguous so contributors know which ports to expect for each command.
• Present the top-level documentation in a logical order: Prerequisites -> Installation -> Usage -> Project Structure for faster discovery.

Description

• Consolidated duplicate ## Prerequisites entries into one section and kept unique dependency lines (Modern web browser, Local web server with python3 -m http.server 8000 / npx serve).
• Normalized the example commands in ## Installation to include python3 -m http.server 8000 and npx serve and updated ## Usage to show the expected local URLs for each command.
• Removed duplicate ## Project Structure blocks and kept a single canonical project layout further up the document.
• Reordered README headings so the top sections appear in the requested sequence.

Testing

• Verified heading locations with rg -n '^## (Prerequisites|Installation|Usage|Project Structure)' README.md and confirmed a single ## Prerequisites with rg -n '^## Prerequisites' README.md (both succeeded).
• Confirmed file changes are staged and committed with git status --short and git commit (commit succeeded).
• Created the PR message via the repository helper (make_pr) and the PR metadata was generated successfully.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
connect.meechain	Error		May 3, 2026 11:35pm
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📥 Commits

Reviewing files that changed from the base of the PR and between 1664b06 and 67239b3.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/consolidate-prerequisites-in-readme.md

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[railway-app]

🚅 Deployed to the MeeChain-Connect-pr-74 environment in meechain

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	meechain-connect	67239b3	May 03 2026, 11:35 PM