i18n(pl): update getting started

[erbierc]

Description (required)

First part of the PR introduces changes from history. Second part is some linguistic changes that are meant to make the polish version sound more natural and readable.

Related issues & labels (optional)

• Closes #N/A
• Suggested label: i18n

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Tracked Files

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pl/getting-started.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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