remove solution explanations

[rohitpaulk]

remove solution explanations

---

Note

Deletes explanation.md guides for 01-dr6 in multiple language solution folders.

• Docs:
  • Remove solutions/*/01-dr6/explanation.md across languages:
    • c, clojure, cpp, csharp, elixir, gleam, go, java, javascript, kotlin, python, ruby, rust, swift, typescript, zig.

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