[Docs] Refine README and npmjs landing page

[minggangw]

Reorder, trim, and align the README and the npmjs landing page so they read cleanly for ROS 2 developers (repo) and web developers shopping on npmjs (package page).

README.md

• Reorder ## sections by ROS 2 developer priority: promote ROS 2 Interface Message Generation, Using rclnodejs with TypeScript, and rosocket above the demo sections; demote Electron-based Visualization and rclnodejs-cli.
• Drop the standalone ## API Documentation section; fold the link into the Documentation TOC.
• Add rosocket to the "Key features" line; refresh docs.ros.org reference links to en/lyrical/.
• Trim filler across Installation, Quick Start, ROS 2 Interface Message Generation, TypeScript, Performance Benchmarks, rclnodejs-cli, and Electron-based Visualization (single demo, smaller screenshot).

scripts/npmjs-readme.md

• Sync the same Install/Prebuilt/Message-Generation/TypeScript trims so the npm landing page stays consistent with the repo README.
• Add a lean rosocket section between TypeScript and License.
• Reorder "Documentation and Examples" bullets to surface rosocket above Electron.

Fix: #1458

[Copilot]

Pull request overview

This pull request refines the project’s primary documentation surfaces (repo README.md and the npm package landing page README) to better match the needs of ROS 2 developers and npm users, including surfacing rosocket and tightening installation/message-generation guidance.

Changes:

• Reorders and trims sections in README.md, folding the API docs link into the Documentation section and promoting rosocket/TypeScript/message generation.
• Syncs the npmjs landing page (scripts/npmjs-readme.md) with the updated install/prebuilt/message-generation/TypeScript guidance and adds a concise rosocket section.
• Updates/standardizes various phrasing (e.g., prebuilt binaries wording, license wording) and reorganizes example/demo links.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
README.md	Reorganizes and trims the main README; promotes message generation/TypeScript/rosocket content and updates the documentation links/sections.
scripts/npmjs-readme.md	Aligns the npm landing page README with the repo README structure and adds a lightweight rosocket section and reordered example links.

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[coveralls]

coverage: 85.864%. remained the same — minggangw:fix-1458-14 into RobotWebTools:develop