Feature Dijkstra on some pages 🐱

[pil0u]

Summary of changes and context

Part 1 of #662

• Add Dijkstra on code-of-conduct, countdown, profile, stats and the-wall pages
• Reword and redesign a little The Wall

Sanity checks

• [x] Linters pass
• [x] Tests pass
• [x] Related GitHub issues are linked in the description
• [x] Merge conflicts are resolved