Merge pull request #2 from jvns/patch-1

Change the text of the register / submit a talk links
Get rid of _site dir.

It was probably checked in accidentally.
Ignore generated site.
Add a preliminary Code of Conduct page
Merge pull request #4 from lfranchi/gh-pages

Add a preliminary Code of Conduct page
Remove reference to hotel staff

I also removed the part saying that we'll have t-shirts, since we don't know that.
Make links underlined
Make link underlines dotted instead of solid
Add page for CFP