Docs: update echarts links

[mlibbey]

In https://tabix.io/doc/draw/Draw_Chart/#group-columns the links to echarts need updating: https://ecomfe.github.io/echarts-examples/public/editor.html?c=area-basic --> https://echarts.apache.org/examples/en/editor.html?c=area-basic

https://ecomfe.github.io/echarts-doc/public/en/option.html#series-line --> https://echarts.apache.org/en/option.html#series-line

as echarts is now an apache icubator project.