[Accessibility] Navbar logo missing alt text causing WCAG violation

Description

The ATT&CK logo in the navigation bar is missing alternative text, making it inaccessible to screen reader users and violating WCAG guidelines.

Why is this important?
When the purpose of a link is clear users can easily navigate links on the page without having to see the surrounding information for context.

Problem Details

• Location: attack-theme/templates/macros/navigation_menu.html
• Element: <img> tag within the navbar brand link
• Violation: Hyperlink has no link text, label or image with a text alternative
• WCAG Guideline: WCAG 2.2 Level A - 1.1.1 Non-text Content

Impact

• Screen reader users cannot identify the purpose of the logo link
• Users relying on assistive technologies don't know this element navigates to the homepage
• Fails accessibility compliance standards

Expected Behavior

The logo image should have descriptive alt text that indicates both the brand and link destination, such as alt="ATT&CK Home".

Suggested Fix

Add alt="ATT&CK Home" attribute to the logo image element to provide meaningful alternative text for assistive technologies.