Calendar Yearview with Blocks
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TODO/IDEA:
- A bit of spacing or a line between months, as seen on https://observablehq.com/@d3/calendar-view and https://communities.sas.com/t5/Graphics-Programming/Fun-With-SAS-ODS-Graphics-Calendar-Heatmap/td-p/468258
- Allow for different date formats
- Allow navigation between years (past & future)