[Frontend] Grab tasks from Canvas

[fmcubium]

See issue #86.

The Frontend should be able to render tasks grabbed from Canvas.

[lu2400]

hello, can i work on this please for my cen3031 project?

[anthisse]

Taking this issue. There are two strategies to getting Canvas tasks; one is to grab the JSON information a Cavnas calendar export, the other is to directly grab the JSON by piggybacking off of the user's login token to make FETCH requests. These are described in #65 and #61 respectively. I'll go ahead with the calendar parsing, but perhaps we should keep the login token idea in mind.