Update dependency @vue/eslint-config-prettier to v8

See merge request !9

Update dependency prettier to v3

See merge request !8

Overlapping items in a column

See merge request !11

Change zIndex of dragged item to be the biggest

See merge request !10

Resolve "Implement basic functionality"

Closes #1, #2, #3, #4, #5, and #6

See merge request !2

This reverts commit b135910c.