[Bug][Accessibility] Missing `alt` attribute for Kmesh logo in About section

Task Description

The Kmesh logo image in the About section (src/components/About/index.js) is missing an alt attribute.

This is an accessibility issue because screen readers cannot provide a meaningful description of the image. It is also a minor SEO improvement.

Current Code

<img className="portrait" src="img/Kmesh-icon.png"></img>

Expected Behavior

The image should include a descriptive alt attribute so that assistive technologies can correctly identify it.

Proposed Solution

Update the image element to include an appropriate alt attribute and use the self-closing JSX syntax.

Example:

<img
  className="portrait"
  src="img/Kmesh-icon.png"
  alt="Kmesh logo"
/>

This improves accessibility while following standard JSX conventions.