Makdown Helper - Add "remove storyboard row" function

[justinsantoro]

I decided I wanted to remove a shot completely from a storyboard today which proved to be tedious. It would be nice to add a delete row function to the markdown helper script.

Would have to pass the row to be deleted and where to add the VO lines from that row. ie append VO lines to previous row, or prepend to following row.

So to delete row 3 from the storyboard in workdir, append the VO lines to the row before and refactor img filenames: ./mdh delete 3 before --img

To refactor img filenames, shot_3.svg would be deleted and shot_4 renamed to shot_3, etc.

[justinsantoro]

Implemented this without the handling of VO lines. Those are easy enough to fix manually. https://github.com/raedahgroup/video-production/commit/cc2d85b1e82760f269cf9b1783fccffbe547472e