Readme: the documentation moved to .io

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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 # WireGuard — fast, modern, secure kernel VPN tunnel
 #### by [Jason A. Donenfeld](mailto:Jason@zx2c4.com) of [Edge Security](https://www.edgesecurity.com/)
 
-WireGuard is a novel VPN that runs inside the Linux Kernel and utilizes **state-of-the-art [cryptography](doc/protocol.md)**. It aims to be faster, simpler, leaner, and more useful than IPSec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances. It runs over UDP.
+WireGuard is a novel VPN that runs inside the Linux Kernel and utilizes **state-of-the-art cryptography**. It aims to be faster, simpler, leaner, and more useful than IPSec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances. It runs over UDP.
 
 **More information may be found at [WireGuard.io](https://www.wireguard.io/).**