update landing page examples

[JLHwung]

Closes #2551

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[liuxingbaoyu]

These few examples don't look very good.
The output of the decorator is very, very long and completely unreadable.
The pipeline-operator is not that famous.
record-and-tuple relies entirely on polyfills.

Unfortunately I didn't think of a good example either.

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[JLHwung]

I have removed decorators and pipeline examples. The new examples are from ES2025 and stage 3 explicit-resource-management proposal. Please take a look.

[liuxingbaoyu]

Thanks!
Non-blocking: Would proposal-throw-expressions be better than proposal-do-expressions?

[JLHwung]

I am fine with either proposal, as long as we showcase something still in early stage. That said, I have updated the examples for throw expressions.