Add code repository mirrors

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 A tool to visualize how Unicode code points get encoded into UTF-8.
 
 
 A tool to visualize how Unicode code points get encoded into UTF-8.
 

+Code repository mirrors: [GitHub](https://github.com/ardislu/utf-8-visualizer), [Codeberg](https://codeberg.org/ardislu/utf-8-visualizer), [git.ardis.lu](https://git.ardis.lu/utf-8-visualizer)
+

 ## Local development
 
 Use any local web server to host the static files. For example, if you have Node.js installed:
 ## Local development
 
 Use any local web server to host the static files. For example, if you have Node.js installed: