[move-2024][docs] Update plinko.mdx

[cgswords]

Description

This diretly replaces the plinko code with its Move 2024 equivalent.

This is copy/pasted from this PR and should not be landed until that PR is: https://github.com/MystenLabs/plinko-poc/pull/74

Test plan

:eyes:

---

Release notes

Check each box that your changes affect. If none of the boxes relate to your changes, release notes aren't required.

For each box you select, include information after the relevant heading that describes the impact of your changes that a user might notice and any actions they must take to implement updates.

• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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