Add code repository mirrors

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 Web app to visualize the calculation of a block's hash on Ethereum and EVM-like blockchains.
 
+Code repository mirrors: [GitHub](https://github.com/ardislu/block-hash-calculator), [Codeberg](https://codeberg.org/ardislu/block-hash-calculator), [git.ardis.lu](https://git.ardis.lu/block-hash-calculator)
+
 ## Tests
 
 Requires Node.js **v20+**.