I need to make it possible to simply drag the blocks to rearrange.
Also need to find a place to show an icon that indicates the block can be grabbed to drag. I think positioning the icon on the left side of each block seems most logical, but headings and list items already have a chevron icon on the left side…
For now, I suppose the two buttons in the context menu will be fine. A shortcut would also be nice - perhaps `Cmd+Arrow-up` and `Cmd+Arrow-down`. This is also the same shortcut used in VSCode to move lines up and down.