Updating Logos

1)Superfluous icons have been deleted
2)Added an SVG copy for every logo
3)Added PNG 48x48 copy for every logo
Updating Logos

1)Superfluous icons have been deleted
2)Added an SVG copy for maui's logo
3)Added PNG 48x48 copy for maui's logo
Merge pull request #1 from Jatt159/master

Update grub theme icons