Add YEC 2025 banner to torproject.org sites

Creating this ticket to have a parent ticket

Launch date for YEC 2025 is October 14, 15:00 UTC

Final assets will be delivered by September 11.

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Each year from ~mid-October through the end of December, the Tor Project runs its year-end fundraising campaign (aka "YEC"). This is the time during which we raise the most money per year from individual donors. Our web/tpo strategy for this campaign is to add a branded banner to the top of torproject.org pages.

• Implementation across these sites:
  • torproject.org
  • community.torproject.org
  • support.torproject.org
  • download.torproject.org
• Figma files for inspection: 🌐 Web | torproject.org
• Illustrations:
  • globe-chain-burst.svg
  • heart.svg
• Min height:
  • Desktop: 328px
  • Tablet: 344px
  • Mobile: 426px
• Max height:
  • Desktop: 400px
  • Tablet: 440px
  • Mobile: 500px
• Font:
  • Title: Jacquard 12
    • 85% line height
  • Copy: "New websites" specs (Inter 16px, Inter 14px on mobile)
    • 150% line height
• Color:
  • Banner background: #18232F
  • Title and paragraph text: #ffffff
  • Emphasized paragraph text: #B6E368
  • Button text: #15141A
  • Button background: #B6E368
• Other:
  • Last year's ticket for reference: 2024

cc/ @nicob @bella @gaba @lavamind