Update URL for Sphido

According to a change in the original repo:
sphido/sphido@29a7120

README.md

@@ -57,7 +57,7 @@ A static web site generator is an application that takes plain text files and co
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+*   [Sphido](https://sphido.cz) - A rocket 🚀 fast, lightweight, static site generator `#Node.js`
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