[ImgBot] Optimize images

*Total -- 846.26kb -> 814.15kb (3.79%)

/slides/2025/11/img/comparativa_raspberry_pi.png -- 47.17kb -> 38.41kb (18.57%)
/slides/2025/12/img/palm_treo_750_win.jpg -- 138.36kb -> 132.24kb (4.43%)
/slides/2025/12/img/nokia_E61_symbian_os.jpg -- 230.92kb -> 222.10kb (3.82%)
/slides/2025/12/img/Hp-ipaq-hw910_windows_mobile.jpg -- 180.97kb -> 175.22kb (3.18%)
/slides/2025/11/img/raspberry-pi-5.png -- 248.83kb -> 246.19kb (1.06%)

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