Update README.md

Author: linonetwo

README.md

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 # git-sync-js
 
-[Documentation Site](https://github.com/tiddly-gittly/git-sync-js)
+[Documentation Site](https://tiddly-gittly.github.io/git-sync-js/)
 
 JS implementation for [Git-Sync](https://github.com/simonthum/git-sync), a handy script that backup your notes in a git repo to the remote git services.