Write-up EmberFest videos

We could add some more specific movies if you want :)

Ember Times review template

[x] Add your name to top and bottom
[x] Put emoji in writeup title
[x] Add a short blurb (could be the title) to the beginning
[x] Link to external article/repo/etc in paragraph/body text, not just the writeup title (link in writeup title is optional now)
[x] Add the contributor in the post in format "FirstName LastName (@githubUserName)" linked to their GitHub account
[x] Check that all links work