⭐️ New shortcuts and latest UI improvements in Baserow

Latest updates:

:one: Press Shift + Enter in a selected cell to create a new row.
:two: Press Enter on a selected cell to select a cell below.
:three: Press Shift + Click to select multiple cells: click the first cell in the range, and then hold down Shift while you click the last cell in the range.
:four: Right-click on the row add button + to add multiple rows at a time.
:five: Move to the previous ︿ or next record while viewing the row edit modal.

Which ones should we add next? :ear: