Redesign trends page

[dennissiemensma]

Currently the trend are meant to be plotting data relative to itself. But the units used do not reflect in that an it might cause some confusion. So I suggest we convert it to percentages in stead of Watt or gas.

• Map tariff graphs to passed week and passed month.
• Map all graphs to percentages.
• Discard the currently delivered charts, as it does not reflect actual consumption, only demand.
• Discard the polar chars, as they are nice but not very clear to most users. Replace with bar charts.
• Try to combine both the high and low tariff graphs, as people shouldn't care about the tariff but only about the percentages.

[dennissiemensma]

I've redisigned the Trends page and I'm quite content with it. Nice improvement.

The page now only displays three (bar!) graphs, depending on the data available, and two pie charts for the tariff consumption of the last 7 days and the last month.

[dennissiemensma]

Merged & deployed.