*Total -- 56.62kb -> 24.34kb (57.01%)

/images/database-id-sequence-step.png -- 28.31kb -> 12.17kb (57.01%)
/docs/high-concurrency/images/database-id-sequence-step.png -- 28.31kb -> 12.17kb (57.01%)

更新分库分表后如何生成唯一ID

*Total -- 46.21kb -> 20.38kb (55.89%)

/images/mq-10.png -- 23.11kb -> 10.19kb (55.89%)
/docs/high-concurrency/images/mq-10.png -- 23.11kb -> 10.19kb (55.89%)

- 修改 Kafka 图片小错误
- 调整图片展示位置

*Total -- 30.37kb -> 12.92kb (57.45%)

/images/mq-11.png -- 15.19kb -> 6.46kb (57.45%)
/docs/high-concurrency/images/mq-11.png -- 15.19kb -> 6.46kb (57.45%)

- Update UUID desc to fix #22
- Rename img to images
- Fix typo