cahrt3c - line-chart extension

[ran-codes]

fork line chart and add the following features

• [x] make a copy of your data. (e.g. data2) change y-value, add 20 to each value
• [x] add a drop down that lets you select which dataset you want ot viz
• [x] make the d3 chart update based on the filter.
• [x] extend to 3d (Der spielge approach)

example app > ity levels and trends

[ran-codes]

looks great. started with reactivity in svelete and added d3 transitions. LOOK great!!