Fix Express.js Icon Visibility in Dark Mode on GitHub Profile

The current Express.js icon blends into the background in GitHub’s dark mode, making it barely visible. We can enhance the existing code for the icon by adding a light background (e.g., white/gray) or styling it so that it remains clear in both light and dark themes.

Describe the solution you'd like

• Replace the current icon with a version optimized for both themes (e.g., white variant for dark mode).
• Use an SVG logo and dynamically adjust its fill color depending on the theme.

Additional context

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