Update custom footer text in configuration

Author: GoofySatoshi

_config.butterfly.yml

@@ -265,7 +265,7 @@ footer:
   owner:
     enable: true
     since: 2019
-  custom_text:
+  custom_text: '<img src="https://icraus-blog.top/icp.png"> <a href="http://beian.miit.gov.cn/" style="color:white" target="_blank">浙ICP备2025214344号</a>'
   # Copyright of theme and framework
   copyright: true