Add @yeskunall/astro-umami to the showcase (#123)

Co-authored-by: Florian Lefebvre <[email protected]>

docs/src/content/docs/getting-started/showcase.mdx

@@ -17,6 +17,7 @@ Want to see Astro Integration Kit in real projects? See by yourself!
 - [Astro-Hashnode](https://github.com/MatthiesenXYZ/astro-hashnode) - by Adam Matthiesen
 - [`@inox-tools/sitemap-ext`](https://inox-tools.vercel.app/sitemap-ext) - by Fryuni
 - [Astro Subfont](https://github.com/Namchee/fontsubs/tree/master/packages/astro) - by Namchee
+- [Astro Umami](https://github.com/yeskunall/astro-umami) - by Kunall Banerjee
 
 :::note
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