Add community solution link for Day 8 (#911)

Author: henryk-cesnolovic

docs/2025/puzzles/day08.md

@@ -7,6 +7,7 @@ import Solver from "../../../../../website/src/components/Solver.js"
 https://adventofcode.com/2025/day/8
 
 ## Solutions from the community
+- [Solution](https://github.com/henryk-cesnolovic/advent-of-code-2025/blob/main/d8/solution.scala) by [Henryk Česnolovič](https://github.com/henryk-cesnolovic)
 
 - [Solution](https://github.com/Philippus/adventofcode/blob/main/src/main/scala/adventofcode2025/Day08.scala) by [Philippus Baalman](https://github.com/philippus)