Share event links to social media

[EliseWei]

As a user, I want to easily share a link to an individual event via twitter or facebook.

Design for the "share" icon and position

• [x] investigate twitter and facebook linking features
• [x] plan how you will implement sharing
• [x] implement a "share" functionality for each event

[xavier-fenton]

Not applicable for peer review. Our ticket can't be sure to function properly when deployed. Safe option to wait for deployment and test.

Waiting for Tech Review

[EliseWei]

Putting this back to in-progress since it has a failing test. I'm confirming with the rest of the teaching team whether we'd still like this code to be peer reviewed, even though the feature doesn't work (yet).

[xavier-fenton]

test fixed.