[ImgBot] Optimize images

*Total -- 99.09kb -> 60.05kb (39.39%)

/docs/img/page-dia.svg -- 7.05kb -> 3.78kb (46.39%)
/docs/img/action-groups-dia.svg -- 12.82kb -> 7.48kb (41.7%)
/docs/img/data-dia.svg -- 12.56kb -> 7.63kb (39.25%)
/docs/img/test-dia.svg -- 30.08kb -> 18.34kb (39.02%)
/docs/img/metadata-dia.svg -- 26.91kb -> 16.58kb (38.38%)
/docs/img/section-dia.svg -- 9.67kb -> 6.25kb (35.39%)

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

Author: ImgBotApp