made changes to explore-outside.md to refer to new file kitesurf-in-sant...

I have added to the explore-outside portion of the story and included another link/place to explore.
Please review this, @casey-collab
It looks like this file has been added to a directory that already contained a "page" of the story.  Please create a new directory for each new page to help keep the repository organized.  See the README of this repository for more information.