[ImgBot] Optimize images

*Total -- 24.89kb -> 10.84kb (56.46%)

/html/modules/gnavi/icons/default.gif -- 3.24kb -> 0.94kb (70.96%)
/html/modules/gnavi/icons/xls.gif -- 3.79kb -> 1.19kb (68.75%)
/html/modules/gnavi/icons/doc.gif -- 3.79kb -> 1.21kb (68.11%)
/html/modules/gnavi/icons/mid.gif -- 3.79kb -> 1.31kb (65.48%)
/html/modules/gnavi/icons/ram.gif -- 4.46kb -> 1.68kb (62.37%)
/html/modules/gnavi/images/elfinder_volume_icon.png -- 1.53kb -> 0.99kb (35.12%)
/html/modules/gnavi/images/wide_bt1.png -- 1.50kb -> 1.18kb (21.2%)
/html/modules/gnavi/images/pe_logo.png -- 1.39kb -> 1.15kb (17.15%)
/html/modules/gnavi/images/wide_bt2.png -- 1.38kb -> 1.18kb (14.6%)

Author: ImgBotApp