Multi-level sortable

[alexandernst]

It would be cool if a multi-level sortable could be done.

Item 1
    Sub-item 1
    Sub-item 2
    Sub-item 3
Item 2
Item 3
    Sub-item 1
    Sub-item 2
    Sub-item 3
Item 4

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[kartik-v]

Currently strapped with time and it is not supported in the core html sortable plugin directly (so need to develop a separate jquery extension for this). Feel free to submit a PR to enhance this.