Heatmap calendar representation when data collection on 2 different years

[Thaliehln]

The current heatmap calendar works correctly if data are collected over the same calendar year
Suggests the following

• Add a new calendar heatmap (GitHub template), including conversion to plotly
• Use a conditional check to see if the start/end dates of the dataset are on the same year
• Use the current representation if the start/end dates of the dataset are on the same year, use the new calendar heatmap when the start/end dates of the dataset are on different years