* add missing quotation mark
* make `.htmx-indicator` unsortable
* change cursors to indicate grabbable items
* bug fix:
bug:
when an item is dragged fast enough before the previous request was
completed, dropping after request completion resulted in the addition
of an extra item to the list.
fix:
disable sortable on End event, and re-enable it on htmx:afterSwap.
* add a few inline comments + better naming