Announce PyCon Uganda as host for PyCon Africa 2026

What's Changed

• close CFP 2024 by @HassanBahati in #124
• fix: broken padding on speaker page for mobile screens by @HassanBahati in #126
• docs; add PyCon Uganda Prospectus 2024 by @HassanBahati in #128
• feat: add banner announcing pycon africa 2026 hosts by @HassanBahati in #127

Full Changelog: v2.0.1...V2.0.2