Fix footer style.
Update no talk message.
Use variables for sass colors.
Add a message for when no event is planned.
Add slides and video with Popcorn

Conflicts:
	contents/events/js101-une-introduction-a-javascript.md
Add video/slides to JS101 event

Conflicts:
	contents/events/js101-une-introduction-a-javascript.md
	sass/main.scss
	src/www/config.js
	src/www/kernel.js
	src/www/popcorn-slides.js
	src/www/video.js
	templates/event.hbs