Remove mentions to UFget and fix broken link
Remove mentions to UFget and fix broken link

ScottKolo/suitesparse-matrix-collection-website,ScottKolo/UFSMC-Web,ScottKolo/UFSMC-Web,ScottKolo/suitesparse-matrix-collection-website,ScottKolo/suitesparse-matrix-collection-website,ScottKolo/UFSMC-Web,ScottKolo/suitesparse-matrix-collection-website,ScottKolo/suitesparse-matrix-collection-website