Add social media icons row to footer

[Copilot]

Description

Adds a row of social media icons (Newsletter, GitHub, X) positioned above the copyright section in the footer.

Changes

• _includes/footer.html: Added footer-social-icons div with three Font Awesome icon links (envelope, github, twitter) between footer columns and copyright
• _sass/_layout.scss: Added styles for centered horizontal layout with 15px spacing, hover/focus states, and color transitions

Implementation Details

• Uses existing Font Awesome 2x icons
• Links include rel="noopener noreferrer" for security
• Accessible with aria-label, title attributes, and keyboard focus styles
• URLs set to https://example.com placeholders

Checklist

• Changes follow existing footer styling patterns
• HTML validated
• Security scan passed
• Code review feedback addressed

Screenshot

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 127.0.0.11
  • Triggering command: REDACTED, pid is -1 (packet block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Footer Content Updates</issue_title>
<issue_description>Add a row of Social Icons / Links just above the copyright section.

1. Link to MailChimp Newsletter
2. Link to GitHub Account
3. Link to X Account
4. All links should be on one row</issue_description>

<agent_instructions>If you don't know the links, just make the urls "example.com"</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Footer Content Updates #337

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