[ImgBot] Optimize images

*Total -- 11,070.50kb -> 9,502.44kb (14.16%)

/assets/models/foliage/plant.png -- 2,428.43kb -> 1,445.84kb (40.46%)
/assets/models/car/car_blue.png -- 19.35kb -> 12.19kb (37%)
/assets/models/lamp_post_bench_trashcan/street_lamp.png -- 416.42kb -> 322.31kb (22.6%)
/assets/models/car/car.png -- 20.16kb -> 16.11kb (20.09%)
/assets/models/unfinished_buildings/unfinished_atlas.png -- 1,748.61kb -> 1,504.71kb (13.95%)
/public/publishing/screenshots/screenshot2.png -- 775.41kb -> 719.45kb (7.22%)
/public/publishing/screenshots/screenshot4.png -- 595.33kb -> 555.88kb (6.63%)
/public/publishing/screenshots/screenshot3.png -- 676.35kb -> 633.47kb (6.34%)
/assets/models/hedge/textures/textures3.png -- 178.13kb -> 168.77kb (5.25%)
/public/publishing/screenshots/screenshot1.png -- 1,310.00kb -> 1,243.03kb (5.11%)
/assets/models/hedge/textures/textures.png -- 287.53kb -> 273.58kb (4.85%)
/assets/models/house/textures/house2_tex1.png -- 424.90kb -> 420.11kb (1.13%)
/assets/textures/grass.png -- 2,181.38kb -> 2,178.50kb (0.13%)
/.reuse/REUSE-compliant.svg -- 8.51kb -> 8.51kb (0.01%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp