[#2]: filter by month slider

[jeff-s-zhou]

WIP, slider works but there's a minor bug with the default month displayed. Should also probably call the filter function on load by the current month

[Mokosha]

I took a look at this today. Looks like a good start.

We need to be able to fetch more data from the backend for a slider like this to be useful though. That's blocked on lanebreach/lanebreach-api#40 because the amount of data that we fetch ends up being uncompressed and taking way too much time to send. There's a bunch of better architectural changes that we need to implement between frontend and backend, but even sending compressed data will be enough to increase the latency here considerably.