Fixed documentation overview
## Overview
-* How to install it
+* [How to install it](#how-to-install-it)
* [Installing on Linux](#installing-on-linux)
* [Installing on Windows](#installing-on-windows)
* [Installing on Mac OS](#installing-on-mac-os)
* [Using pre-built binaries](#using-pre-built-binaries)
* [Building it from source](#building-it-from-source)
* [Login](#login)
+ * [Retrieving your token via discord or chrome](#retrieving-your-token-via-discord-or-chrome)
* [Features](#features)
* [Extending Cordless via the scripting interface](#extending-cordless-via-the-scripting-interface)
* [Contributing](#contributing)
