[ImgBot] Optimize images (#78)

*Total -- 1,081.84kb -> 934.28kb (13.64%)

/docs/static/icon.png -- 15.99kb -> 5.51kb (65.51%)
/docs/static/preview.png -- 29.82kb -> 17.01kb (42.96%)
/recipes.jpg -- 982.42kb -> 858.30kb (12.63%)
/docs/static/icon.svg -- 0.55kb -> 0.49kb (9.96%)
/docs/static/logo.svg -- 10.64kb -> 10.57kb (0.66%)
/docs/vue-horizontal.svg -- 42.42kb -> 42.39kb (0.06%)

Signed-off-by: ImgBotApp <[email protected]>

Co-authored-by: ImgBotApp <[email protected]>

Author: imgbot[bot]