logo: update NurOS logo and colors

[cicada0961]

Summary

Update NurOS logo with the official braille ASCII art and correct RGB colors.

Related issue

Closes #2365

Changes

• Replace nuros.txt with the official braille ASCII art provided in the issue
• Update colors in n.inc with the correct RGB values (41;19;182, 31;59;205, 18;95;225, 13;125;250)

Screenshots

Checklist

• I have tested my changes locally.

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Up to standards ✅

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Pull Request Overview

The pull request introduces the new Braille-based ASCII art for the NurOS logo, but contains a critical formatting error that will prevent correct terminal rendering. Specifically, the ANSI 24-bit color sequences in n.inc are missing the mandatory 'm' termination character, which typically results in corrupted terminal output.

Furthermore, there is a discrepancy between the defined color palette and the ASCII template. Although four specific RGB colors were added to create a gradient effect, the nuros.txt file only utilizes the first color placeholder ($1) for every line. This leaves three-quarters of the defined palette unused and prevents the intended gradient from appearing. These issues should be addressed before merging to ensure the logo renders as intended.

About this PR

• The current implementation of the ASCII art in 'nuros.txt' only utilizes the '$1' placeholder. This effectively ignores the colors '$2', '$3', and '$4' defined in the 'n.inc' palette, resulting in a monochromatic logo rather than the intended gradient.

Test suggestions

• NurOS logo renders using the new Braille character set
• Logo leverages all 4 colors in the defined RGB palette
• Key color is correctly assigned to the light blue RGB value (13;125;250)

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. Logo leverages all 4 colors in the defined RGB palette

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