Make use of daily data stats

[TrystanLea]

Make use of the new daily data pipeline with a daily data visualisation tool that allows for e.g the plotting of internal – outside temperature vs space heating demand, with the option to add a line of best fit and projection for space heating demand at design temperature (if no datapoints exist for this condition already).

[TrystanLea]

A first stage implementation of this is now complete: https://heatpumpmonitor.org/daily

Next steps:

• Add simple CSV export option
• Provide some head line stats such as COP, kWh elec and heat
• Add line plotting