[improvement][docs]update README and demo video

README.md

@@ -21,7 +21,7 @@ With these ideas in mind, we develop SuperSonic as a practical reference impleme
 
 - Built-in CUI(Chat User Interface) for *business users* to enter data queries
 - Built-in GUI(Graphical User Interface) for *analytics engineers* to build semantic models
-- Built-in GUI for *system administrators* to manage chat plugins and agents
+- Built-in GUI for *system administrators* to manage chat agents and third-party plugins
 - Support input auto-completion as well as query recommendation
 - Support multi-turn conversation and history context management 
 - Support four-level permission control: domain-level, model-level, column-level and row-level

README_CN.md

@@ -19,7 +19,7 @@
 
 - 内置对话界面以便*业务用户*输入数据查询。
 - 内置图形界面以便*分析工程师*构建语义模型。
-- 内置图形界面以便*系统管理员*管理问答插件和助理。
+- 内置图形界面以便*系统管理员*管理第三方插件和对话助理。
 - 支持文本输入的联想和查询问题的推荐。
 - 支持多轮对话，根据语境自动切换上下文。
 - 支持四级权限控制：主题域级、模型级、列级、行级。