feat(showcase): Add nikodemdeja.pl to showcase

[Norem80]

Description

Adding my portoflio website built wiiiith gatsby to the showcase ❤️.

• Site
• Source code

[LekoArts]

Hi!

Please add source_url (shown like here) if you add the "Open Source" tag. Thanks!

[LekoArts]

Thanks! 👍

[gatsbot]

Holy buckets, @Norem80 — we just merged your PR to Gatsby! 💪💜

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