Add link to Edmonton Public Library hackathon details

Hey @raqmann ! I'm a volunteer from the Toronto civic tech community. I'm in the process of updating the [codeacross.ca](codeacross.ca) website for the 2018 season.

I see that you were the hackathon organizer last year. Might you be the correct person to have looped into this conversation?

Start by reviewing the Jekyll site's existing event or content pages and the issue conversation. The issue asks whether the organizer is the right contact but does not provide the Edmonton link or identify a target page; done means confirming those details and adding the link to the appropriate site content.

索引モデルが issue の本文から書いたものです。