docs(welcome): replace QQ group number with scannable QR code

docs/welcome.md

@@ -15,7 +15,7 @@ displayed_sidebar: home
 
 - 官方论坛: [Radxa Forum](http://forum.radxa.com) - 主要技术支持渠道，中英文都支持，中文发帖需要发到中文板块。
 - Discord社群: [Radxa Discord](https://rock.sh/go) - 英文实时讨论群
-- QQ群: 591048098 - 中文讨论 QQ 群
+- QQ群: ![Radxa 中文 QQ 群](/zh/img/qq_group/qq_group.webp) 中文讨论 QQ 群
 - 微信群: ![Radxa ROCK5B](/zh/img/wechat_group/ROCK5B.webp) 中文讨论微信群
 
 注意:

i18n/en/docusaurus-plugin-content-docs/current/welcome.md

@@ -15,7 +15,7 @@ If you encounter any problems while using this documentation, please [submit an
 
 - Official Forum: [Radxa Forum](http://forum.radxa.com) - Main technical support channel, both English and Chinese are supported, Chinese content should be posted in the [Chinese section](https://forum.radxa.com/c/world/china).
 - Discord Community: [Radxa Discord](https://rock.sh/go) - Instant chatting and discussion group, English only
-- QQ Group: 591048098 - QQ Discussion group, mostly Chinese
+- QQ Group: ![Radxa QQ Group](/zh/img/qq_group/qq_group.webp) QQ Discussion group, mostly Chinese
 - QQ Channel: [Radxa QQ Channel](https://pd.qq.com/s/23wlhn9j8)
 - WeChat group: ![Radxa ROCK5B](/zh/img/wechat_group/ROCK5B.webp), mostly Chinese