chore: update contact (#3809)

Author: lxfu1

site/docs/manual/contact.en.md

@@ -14,7 +14,3 @@ If you have any questions, suggestions, feedback or willingness to communicate,
 - Zhihu：https://zhuanlan.zhihu.com/aiux-antv
 
 - Contribution Guide：https://www.yuque.com/antv/g2plot/apubgw
-
-- DingTalk Group Number: 30233731 / 35686967 (Group 2) / 44788198 （Group 3）
-
-<img src="https://gw.alipayobjects.com/zos/antfincdn/hTzzaqgHgQ/Antv%252520G2%252520%26%252520G2Plot.png" width="200" height="266" />

site/docs/manual/contact.zh.md

@@ -14,7 +14,3 @@ order: 9
 - 知乎专栏：https://zhuanlan.zhihu.com/aiux-antv
 
 - 共建指南：https://www.yuque.com/antv/g2plot/apubgw
-
-- 钉钉群组号码: 30233731 / 35686967 (2 群) / 44788198 （3 群）
-
-<img src="https://gw.alipayobjects.com/zos/antfincdn/hTzzaqgHgQ/Antv%252520G2%252520%26%252520G2Plot.png" width="200" height="266" />