Accessibility issue - Add alt-text to the social media icons in the footer

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Problem/Motivation

Attempt to make Drupal.org 100% accessible

Proposed resolution

Adding alt text to the social media logos.

Target date or deadline

Remaining tasks

AI usage (if applicable)

[ ] AI Assisted Issue
This issue was generated with AI assistance, but was reviewed and refined by the creator.

[ ] AI Assisted Code
This code was mainly generated by a human, with AI autocompleting or parts AI generated, but under full human supervision.

[ ] AI Generated Code
This code was mainly generated by an AI with human guidance, and reviewed, tested, and refined by a human.

[ ] Vibe Coded
This code was generated by an AI and has only been functionally tested.