docs: add Imk&Cc's homepage to showcase.md (#595)
* add Imk&Cc's homepage to showcase.md
* Update showcase.md
* Update showcase.md
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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/topo-da-mente/) |
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| | | - [Mau Camargo's Notkesto](https://notes.camargomau.com/) |
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| | | - [Caicai's Novels](https://imoko.cc/blog/caicai/) |
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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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