Update press kit downloads to full media kit bundle

[tkodev]

The press kit page currently only offers techtank-logos.zip. Replace all download links with a complete techtank-mediakit.zip bundle.

Bundle contents (we need to make these!)

• Logos (Exists but we may have new logos potentially)
• Brand guidelines PDF (capture of the design system page)
• Speaker slide template
• Speaker checklist
• Host checklist

Acceptance criteria

• techtank-mediakit.zip assembled with all five items above
• All download links on /press-kit point to the new bundle
• Old techtank-logos.zip removed (or kept only if organizers confirm it should remain as a separate option)

[tkodev]

These figma brand guidelines / design content in the past may help:

• Old Brand Identity
• Poster Design Content

[tkodev]

Awaiting logo redesign