[ImgBot] Optimize images (#333)

*Total -- 152.97kb -> 114.57kb (25.1%)

/docs/images/ReactiveSequence.svg -- 7.58kb -> 4.59kb (39.47%)
/docs/images/SequenceNode.svg -- 11.28kb -> 7.12kb (36.87%)
/docs/images/SequenceStar.svg -- 11.22kb -> 7.09kb (36.8%)
/docs/images/DecoratorEnterRoom.svg -- 20.71kb -> 13.30kb (35.77%)
/docs/images/FallbackBasic.svg -- 19.09kb -> 12.64kb (33.79%)
/docs/images/FetchBeer.svg -- 24.30kb -> 16.36kb (32.66%)
/docs/images/SequenceBasic.svg -- 6.32kb -> 5.49kb (13.04%)
/docs/images/Tutorial1.svg -- 6.67kb -> 5.94kb (10.98%)
/docs/images/FetchBeerFails.svg -- 6.46kb -> 5.83kb (9.76%)
/docs/images/FetchBeer2.svg -- 14.99kb -> 13.76kb (8.18%)
/docs/images/Tutorial2.svg -- 24.35kb -> 22.44kb (7.85%)

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

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

Author: imgbot[bot]