fix: Don't aggressively trim code whitespace

[altano]

If code was contained in a nested child (such as when processing markdown) we would previously aggressively .trim() the output. Since there can be intentional leading/trailing space in a markdown code block (e.g. for indentation) this is probably too aggressive.

Instead, we now just strip all trailing newlines.

BEFORE	AFTER

Fixes https://github.com/code-hike/bright/issues/23

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Name	Status	Preview	Comments	Updated (UTC)
bright	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 23, 2023 0:18am

[pomber]

Thank you!