[ImgBot] Optimize images (#3094)

*Total -- 454.86kb -> 406.40kb (10.65%)

/website/static/img/showcase/snippetexpandergui-select-snippet.png -- 140.27kb -> 113.72kb (18.93%)
/website/static/img/showcase/snippetexpandergui-search-and-paste.png -- 86.16kb -> 70.75kb (17.88%)
/website/static/img/showcase/snippetexpandergui-add-snippet.png -- 36.61kb -> 30.74kb (16.04%)
/website/static/img/icon-linux-dark.svg -- 2.56kb -> 2.38kb (7.02%)
/v2/pkg/templates/templates/preact/frontend/src/assets/preact.svg -- 1.54kb -> 1.49kb (3.54%)
/website/static/img/sponsors.svg -- 187.71kb -> 187.32kb (0.21%)

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v2/pkg/templates/templates/preact/frontend/src/assets/preact.svg

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