fix documentation link to nvim intro
fix documentation link to nvim intro

dev0x/neovim.github.io,neovim/neovim.github.io,neovim/neovim.github.io,dev0x/neovim.github.io,dev0x/neovim.github.io,pygeek/neovim.github.io,pygeek/neovim.github.io,pygeek/neovim.github.io,neovim/neovim.github.io