[ImgBot] Optimize images

*Total -- 3,862.42kb -> 2,658.99kb (31.16%)

/images/eureka-instance-registered-currently.png -- 91.76kb -> 50.09kb (45.41%)
/images/eureka-server-homepage.png -- 252.88kb -> 138.39kb (45.28%)
/images/eureka-server-instanceresource-renew.png -- 653.37kb -> 400.99kb (38.63%)
/images/eureka-server-instanceresource-cancellease.png -- 403.08kb -> 248.14kb (38.44%)
/images/eureka-server-applicationresource-addinstance.png -- 550.29kb -> 339.95kb (38.22%)
/images/eureka-service-consumer-fetchregistry.png -- 451.96kb -> 281.65kb (37.68%)
/images/eureka-server-registry-structure.png -- 141.08kb -> 88.49kb (37.27%)
/images/eureka-server-evict-sequence-chart.png -- 154.79kb -> 124.97kb (19.26%)
/images/eureka-service-provider-renew-sequence-chart.png -- 112.55kb -> 91.66kb (18.56%)
/images/eureka-service-consumer-update-sequence-chart.png -- 170.21kb -> 139.33kb (18.14%)
/images/eureka-service-provider-register-sequence-chart.png -- 112.60kb -> 92.67kb (17.7%)
/images/eureka-service-provider-cancel-sequence-chart.png -- 129.78kb -> 109.80kb (15.4%)
/images/eureka-server-cancellease-sequence-chart.png -- 165.07kb -> 142.33kb (13.78%)
/images/eureka-server-renew-sequence-chart.png -- 167.14kb -> 144.82kb (13.35%)
/images/eureka-service-consumer-fetch-sequence-chart.png -- 133.50kb -> 115.95kb (13.15%)
/images/eureka-server-register-sequence-chart.png -- 172.37kb -> 149.76kb (13.11%)
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