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

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🔄️	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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[onlyhans-dev]

Maybe Zobacz instead of Odkryj? 🤔

I'm also thinking about translating landing page to strona startowa, nobody says that, and I often hear just the English phrase. Maybe strona docelowa or even wizytówka will be better?

[erbierc]

Good point on both, will change that

[yanthomasdev]

LGTM! Thanks!