update the demo of compact node chart

In order to make enough space fro users to build up their remote datasource, we make the following changes in this version:

1. remove the option "ajaxURL"
2. remove the events "load-[relation].orgchart"
3. add new method "addAncestors(data, parentId)"
4. add new method "addDescendants(data, $parent)"

abandon the optional URL string of option "data" and make enough space for users to build up their ajax requests

bug-fix: compact nodes can not be opened after collapsing their siblings

Users can use data prop "compact" or option "compact" to build up the compact layout.

since this version, users are allowed to replace built-in icons with Font Awesome icons(or other icons).

You can use crossorigin="anonymous" setting to export the charts with nodes containing pictures.

Users are allowed to make a certain branch of the chart to be displayed as vertical by data.

Users are allowed to drag&drop in the hybrid(horizontal + vertical) chart.

We refactor e2e testing based on cypress