Update homepage initiatives section

[AJaccP]

As a visitor, I want the Initiatives section on the homepage to show relevant, active initiatives so I can discover what the CCSS offers.

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🧠 Context

The Initiatives section on the homepage has two issues:

A) The "Initiatives" heading links to #comingsoon, which goes nowhere. It should just be a plain heading with no link.

B) Two of the three currently displayed initiatives are no longer relevant:

• CCSS Magazine — no longer active
• DiscreteMath.ca — already marked active: false in the data file but still rendered

These should be replaced with:

• CCSS YouTube Channel — where event recordings are posted (https://www.youtube.com/@carletoncomputersciencesoc305)
• Resources — the resources section of the CCSS website (/resources)

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🛠️ Implementation Plan

1. Fix the heading link in layouts/index.html

   Find the Initiatives section heading and remove the <a> tag wrapping it, leaving just the heading text.

2. Update data/initiatives.yml

   • Comment out the CCSS Magazine and DiscreteMath.ca entries (and set active: false on Magazine if not already)
   • Add two new entries for the YouTube channel and the Resources page. Each entry needs: title, link, color, description, and active: true. Pick a fitting color and description for each — the existing entries are a good reference for style.

3. Verify with hugo server that the Initiatives section shows the correct three cards (Questions Repository, YouTube, Resources) and that the heading is no longer a link.

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✅ Acceptance Criteria

• The "Initiatives" heading on the homepage is no longer a link
• CCSS Magazine and DiscreteMath.ca are commented out in data/initiatives.yml
• YouTube channel and Resources page appear as active initiative cards
• All three visible initiative cards have working links