Update _sg_wd101_b.html.erb

I added the link to the event on Google.
Show green checkmark by completed courses on course index
Add Capybara selector to find link by href
Passing happy and sad paths in course completion indicator specs
Merge branch 'master' of https://github.com/TheOdinProject/theodinproject into CourseCompleteIndicator
Merge pull request #63 from tjperry07/patch-1

Update _sg_wd101_b.html.erb/I added the link to the event on Google