You enter command mode by typing `:` while in navigation mode. You can then
type a command and hit `Enter` to execute it or `Esc` to cancel.
The currently supported commands are:
*`write [path]` save the current spreadsheet. If the path is provided it will save it to that path. If omitted it will save to the path you are currently editing. `w` is a shorthand alias for this command.
*`insert-rows [number]` Inserts a row into the sheet at your current row. If the number is provided then inserts that many rows. If omitted then just inserts one.
*`insert-cols [number]` Just line `insert-rows` but for columns.