[ImgBot] Optimize images

*Total -- 6,346.90kb -> 5,424.86kb (14.53%)

/docs/contests/assets/THUAI8/intro/Server.png -- 51.50kb -> 23.80kb (53.79%)
/docs/contests/assets/THUAI8/intro/Success.png -- 4.85kb -> 2.67kb (44.95%)
/docs/contests/assets/THUAI8/intro/installer.png -- 173.04kb -> 97.79kb (43.49%)
/docs/contests/assets/THUAI8/intro/py.png -- 8.78kb -> 5.58kb (36.41%)
/docs/contests/assets/THUAI8/intro/vs.png -- 60.54kb -> 41.18kb (31.98%)
/docs/contests/assets/THUAI8/intro/Cppbuild.png -- 20.63kb -> 14.24kb (30.98%)
/docs/contests/assets/THUAI8/intro/apipy.png -- 28.61kb -> 19.84kb (30.65%)
/docs/contests/assets/THUAI8/intro/api.png -- 23.21kb -> 16.76kb (27.77%)
/docs/contests/assets/THUAI8/intro/Avalonia.png -- 131.68kb -> 96.43kb (26.77%)
/docs/contests/assets/THUAI8/intro/package.png -- 67.30kb -> 51.32kb (23.75%)
/docs/contests/assets/THUAI8/intro/Debug.png -- 37.53kb -> 29.56kb (21.23%)
/docs/contests/assets/THUAI8/intro/Clientdebug.png -- 56.28kb -> 44.69kb (20.59%)
/docs/contests/assets/THUAI8/interface.png -- 5,682.96kb -> 4,981.00kb (12.35%)

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