Uptime checking frontend

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We need a frontend for the uptime uptime checking of a dashboard. Patrick suggested to look at something like this: https://www.traviscistatus.com/
In our case, we'd have one simple bar with x amount of small bars indicating whether there was downtime for that dashboard on that given day.

Once the backend API is working, it will do the following.
A GET request to /api/dashboards/<id>/downtime will return an object with a number of fields:

• downtime_intervals: not really relevant for this, will describe this in detail in the API spec
• downtime_percentage: downtime percentage
• precise_downtimes: an object, containing as keys dates (YYYY-mm-dd); each entry is an object containing hours, minutes, seconds and microseconds indicating the total downtime of that day
• hour_downtimes: an object with dates as keys (same as precise_downtimes), but each entry is a floating point number indicating the total downtime in hours on that day

Currently passing in a date range is not possible but that's something that can be added later. At the moment the results apply to the past 90 days. (Like the Travis CI status example).