Platform review changes

@DavidMascio please update these links to point to the relevant pages on GitHub (i.e. https://github.com/duckduckgo/duckduckgo-documentation/blob/master/duckduckhack/goodie/goodie_triggers.md)

We have an internal process that converts the links when the docs get published to the live site. That way the docs remain usable even on GitHub :)