API: Return count of postcards sent

[conorgil]

Goal: Allow the website to display the current number of postcards that have been sent. For example "We let 10,453 registered voters in Philly know that they can vote from home. Help spread the word!"

Acceptance Criteria:
[ ] Have an API end point that looks up the total number of postcards that have been sent and returns that number

• Setup CORS to reject requests from other origin (tiny help to prevent API abuse)

[ravenac95]

This issue is funny cause in mid 2000s you'd just build this into the webpage instead of using javascript to make some xhr request :P. Tho this makes sense cause all the other parts of the page are easily cached.