Staff Home Page Bug Fixes and Removal of Staff's ability to add a volunteer

Fixed several bugs with the staff home page relating to the pagination links. 

Fixed a bug that cause the sorting order for each column in a table to be related when they shouldn't be related. 

Fixed a bug that caused the Project Coordinator Table, Leadership Team Member Table, and Committee Member table to show an active next link for an empty table.

Changed the way sort order is kept track of. The strings 'asc' and 'dec' are no longer used. Instead 1 is used for ascending order and -1 for descending order.

Removed the ability to add volunteers on the staff side