fix: archive CMC Study Group Meeting and update playlist link

[Sohamsig]

Description

• Archives the CMC Study Group Meeting (series concluded May 8th)
• Adds visual distinction between active and archived meetings
• Updates YouTube playlist link to correct CMC playlist
• Archived meetings render in a separate dimmed section below active table

Fixes

Fixes #7726

[github-actions]

Preview deployment for PR #7729 removed.

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[Rajesh-Nagarajan-11]

Remove Layer5 meeting heading in archive

[Sohamsig]

Hi @Rajesh-Nagarajan-11, thank you for the feedback!

I have fixed the issue by adding a showHeader prop to the Table
component that hides the "Layer5 Meetings" heading when rendering
the archived meetings section.

Please review the latest commit. Let me know if any further
changes are needed!