Readme branding changes

[sskrishnak]

Description

This PR updates the node wire README.md branding section to improve the visual presentation and accessibility of the project header.

Changes include:

• Added the node wire brand icon next to the main README title.
• Added the primary node wire logo in the README header section.
• Improved logo alignment and sizing for a cleaner visual layout.

Related Issue

N/A

Type of Change

• Documentation

Checklist

• I ran the quality checks locally (ruff, mypy, bandit, pytest).
• New files include the required SPDX/REUSE license header.
• I added or updated tests where appropriate.
• I updated documentation where appropriate.
• My commits use a correctly configured git identity (real name and email).
• All my commits are signed off (git commit -s) per the DCO.