Update README.md

README.md

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 We have detailed installation instructions in our wiki:
 
-* [Installing ShareLaTeX in Production](https://github.com/sharelatex/sharelatex/wiki/Production-Installation-Instructions)
+* [Installing ShareLaTeX in Production using docker](https://github.com/sharelatex/sharelatex/wiki/Production-Installation-Instructions)
 * [Setting up a ShareLaTeX Development Environment](https://github.com/sharelatex/sharelatex/wiki/Setting-up-a-Development-Environment)
 
 **If you have any problems, have a look at our page of [Frequent Problems and Questions](https://github.com/sharelatex/sharelatex/wiki/FAQ).**