i18n(pl): update getting-started.mdx

[gacek1123]

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Reopened #8207 because I forgot it was still open and deleted my fork (oops).

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• Suggested label: i18n

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	May 16, 2024 4:24pm

[astrobot-houston]

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Locale	File	Note
pl	getting-started.mdx	Localization changed, will be marked as complete.
pl	ui.ts	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.

[V3RON]

There is this banner present on main:

banner:
  content: |
    Join us and 100+ Astro developers at <a href="https://lu.ma/astro-together-meetup-2024/">Astro Together</a> in Montreal on May 28th!

Should we include that? 🤔

[gacek1123]

I didn't want to include that since it'll no longer be valid in about two weeks and I've seen other translations with even older ones still present. It could become misleading

[yanthomasdev]

LGTM! Thanks