Competition series pages

[mckeenicholas]

Closes #49

Currently, there are some edge cases that aren't fully accounted for (multi-location competitions, series with different registration opening/closing dates). I can change the code to account for that or create a new issue if needed.

I've also removed the competition finder page for a separate pull request.

Will need someone to review my French translations (mostly copied from the WCA site or from Google Translate).

[mckeenicholas]

Single Competition Page

Series page

Single competition in series.

[mckeenicholas]

Mobile view for series

[mckeenicholas]

Multi-location competition.