docs: Update showcase.md (#540)
changed URL
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| | | - [Pelayo Arbues' Notes](https://pelayoarbues.github.io/) |
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| | | - [Vince Imbat's Talahardin](https://vinceimbat.com/) |
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| | | - [🧠🌳 Chad's Mind Garden](https://www.chadly.net/) |
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| | | - [Pedro MC Fernandes's Topo da Mente](https://www.pmcf.xyz/notes/) |
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| | | - [Pedro MC Fernandes's Topo da Mente](https://www.pmcf.xyz/topo-da-mente/) |
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| | | If you want to see your own on here, submit a [Pull Request adding yourself to this file](https://github.com/jackyzha0/quartz/blob/v4/docs/showcase.md)! |
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