[ImgBot] Optimize images

*Total -- 2,419.77kb -> 1,177.24kb (51.35%)

/img/n_128a.gif -- 2,201.10kb -> 959.83kb (56.39%)
/img/t_10.gif -- 17.03kb -> 16.78kb (1.46%)
/img/t_9.gif -- 14.98kb -> 14.78kb (1.36%)
/img/t_2.gif -- 15.83kb -> 15.67kb (1.01%)
/img/t_8.gif -- 17.92kb -> 17.80kb (0.71%)
/img/t_7.gif -- 14.91kb -> 14.81kb (0.66%)
/img/t_12.gif -- 17.57kb -> 17.47kb (0.58%)
/img/t_5.gif -- 14.06kb -> 14.00kb (0.45%)
/img/t_6.gif -- 15.38kb -> 15.32kb (0.44%)
/img/t_0.gif -- 18.04kb -> 17.98kb (0.34%)
/img/n_128.gif -- 8.46kb -> 8.43kb (0.31%)
/img/t_1.gif -- 14.77kb -> 14.75kb (0.18%)
/img/t_3.gif -- 16.33kb -> 16.30kb (0.16%)
/img/t_11.gif -- 15.51kb -> 15.48kb (0.14%)
/img/t_4.gif -- 17.87kb -> 17.85kb (0.12%)
Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>