Fixed sidebar cursor

*-resize cursor styles connotate resizing functionality and indicate that a click & drag motion is required by the users. For the sidebar, this is an incorrect cursor type. Because the appropriate interaction is a simple click, the "pointer" cursor is the correct cursor. That collapse/expand functionality is indicated via the +/- icon (right side) on hover.
Merge pull request #85 from crazyscience/patch-1

Fixed sidebar cursor