[ImgBot] Optimize images

*Total -- 551.46kb -> 438.10kb (20.56%)

/jhipster/gateway/src/main/webapp/swagger-ui/dist/images/throbber.gif -- 9.04kb -> 5.97kb (33.94%)
/jhipster/gateway/src/main/webapp/content/images/jhipster_family_member_2.svg -- 52.99kb -> 40.05kb (24.42%)
/jhipster/gateway/src/main/webapp/content/images/jhipster_family_member_1.svg -- 447.37kb -> 351.57kb (21.42%)
/jhipster/gateway/src/main/webapp/content/images/jhipster_family_member_3.svg -- 25.52kb -> 24.48kb (4.06%)
/jhipster/gateway/src/main/webapp/content/images/jhipster_family_member_0.svg -- 16.54kb -> 16.03kb (3.05%)

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

Author: ImgBotApp