[ImgBot] Optimize images

*Total -- 4,353.43kb -> 4,154.14kb (4.58%)

/pkgdown/favicon/favicon.svg -- 44.79kb -> 0.03kb (99.94%)
/img/README-hypso-1.png -- 135.22kb -> 118.72kb (12.2%)
/img/README-spatvec-1.png -- 171.55kb -> 151.29kb (11.81%)
/img/README-example-tile-2.png -- 1,841.75kb -> 1,780.17kb (3.34%)
/img/README-example-tile-1.png -- 1,342.09kb -> 1,301.47kb (3.03%)
/img/README-example-temp-1.png -- 164.75kb -> 159.84kb (2.98%)
/img/README-hypso-2.png -- 195.34kb -> 190.67kb (2.39%)
/img/README-example-temp-2.png -- 245.99kb -> 240.39kb (2.28%)
/vignettes/aggregate-1.png -- 15.22kb -> 15.12kb (0.62%)
/vignettes/aggregate-2.png -- 19.49kb -> 19.41kb (0.42%)
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/pkgdown/favicon/favicon-96x96.png -- 3.76kb -> 3.76kb (0.18%)
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/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_133_91.jpg -- 12.61kb -> 12.59kb (0.17%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_134_91.jpg -- 7.50kb -> 7.49kb (0.17%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_133_90.jpg -- 15.24kb -> 15.22kb (0.14%)
/vignettes/lux_ggplot-1.png -- 20.97kb -> 20.94kb (0.14%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_135_89.jpg -- 13.09kb -> 13.07kb (0.1%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_134_89.jpg -- 12.07kb -> 12.06kb (0.09%)
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/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_135_91.jpg -- 10.06kb -> 10.05kb (0.07%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_132_89.jpg -- 11.00kb -> 11.00kb (0.05%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_132_91.jpg -- 15.39kb -> 15.38kb (0.05%)
/vignettes/articles/Esri.WorldShadedRelief/Esri.WorldShadedRelief_8_133_89.jpg -- 11.74kb -> 11.74kb (0.03%)

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