Updated _config.yml
Merge branch 'jobs' of https://github.com/cssu/cssu.cdf.toronto.edu into jobs

# By Eugene Cheung
# Via Eugene Cheung
* 'jobs' of https://github.com/cssu/cssu.cdf.toronto.edu:
  Slightly less wonky job postings.
  Cindy stuff.
  More optimization and documentation for slideshow
  Pulling out slideshow styling from main.scss. Also using less vague selectors to improve performance.