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Fixes the accessibility issues still flagged on the homepage (https://issues.apache.org/jira/browse/KAFKA-9528). Most of the 2020 findings (lang attribute, user-scalable=no, main landmark, h1) were already fixed by the Hugo/Docsy migration; this addresses what remains.

Changes:

• content/en/_index.md: add alt="Apache Kafka" to the hero logo image.
• assets/scss/_variables_project.scss (footer only):
• Copyright text, copyright links and footer links: #6c757d -> #ced4da (2.2:1 -> ~7:1 on the #403f4c footer; WCAG AA requires 4.5:1).
• Link hover color: #6c757d -> #fff, so links stay readable on hover (WCAG 1.4.3 also applies to hover states, which automated tools don't test).
• Social icons: #6c757d -> #ced4da, hover #212529 -> #fff. axe doesn't check icon-font glyphs, but they were 2.2:1, below the 3:1 that WCAG 1.4.11 requires for non-text elements.

The hover and icon changes go beyond what the automated audit flags; they are included so the footer meets WCAG in practice, not just on the audit.

Testing: built the site with the project's Hugo Docker image, served it locally and ran Lighthouse 12 (accessibility) on the homepage. Score went from 87 to 98; the only remaining failure is heading-order, which comes from Docsy's blocks/feature shortcode and is left for a follow-up.

This contribution is our original work, and we license it to the project under the project's open source license.

Co-authored-by (mentor): Tiennguyentony Tiennguyentony@gmail.com

[Autumn2OO5]

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[Autumn2OO5]

@chia7712 @hvishwanath Could you take a look when you have a chance? Thanks!