Add 2024 day 19 article

[AvaPL]

I'm quite surprised that this one doesn't have an article yet, so I decided to write it 😄

Happy New Year!

Related PR with the code: #818.

[twentylemon]

LGTM! Happy new year to you as well!

[merlinorg]

Need to update Solver.scala and, when the code PR merges, solutions.

[AvaPL]

You're right, I omitted Solver.scala in my initial commit. Should be good now.

Regarding the solutions, I wasn't sure whether I should include the the submodule stuff in the PR. That's not my first time submitting an article, but the first time submitting one with code 😅 Thanks for pointing that out! I'll include it once the code PR is approved and merged.

[adpi2]

The code has been merged, so you can now include the submodule.

[AvaPL]

Thank you! I rebased and updated the submodules. After building the page locally with yarn, it works fine 😄

[scarf005]

it might be more efficient to use tries, e.g https://github.com/scarf005/aoc-scala/blob/main/2024/day19.scala