docs: remove unused demo link (#2041)

README-ja.md

@@ -62,7 +62,6 @@ Univer は、スプレッドシート、ドキュメント、スライドを含
 | [Sheets Collaboration Playground](https://univer.ai/pro-examples/sheets-collaboration-playground/)<br>Demonstrate the process of collaboration. After A edits the form, how does B process it? Here is an interesting experiment | [![](./docs/img/pro-examples-sheets-collaboration-playground.gif)](https://univer.ai/pro-examples/sheets-collaboration-playground/) |
 | [Sheets Import/Export](https://univer.ai/pro-examples/sheets-exchange/)<br>Supports xlsx file import and export | [![](./docs/img/pro-examples-sheets-exchange.gif)](https://univer.ai/pro-examples/sheets-exchange/) |
 | [Sheets Print](https://univer.ai/pro-examples/sheets-print/)<br>Experience the HD printing capabilities of Univer Sheets | [![](./docs/img/pro-examples-sheets-print.gif)](https://univer.ai/pro-examples/sheets-print/) |
-| [Sheets Data Validation / Conditional Formatting](https://univer-qqqkeqnw5-univer.vercel.app/sheets/)<br>Development preview of Univer Sheets data formats and conditional formatting | [![](./docs/img/examples-sheets-data-validation-conditional-format.png)](https://univer-qqqkeqnw5-univer.vercel.app/sheets/) |
 | <h3>📝 Univer Docs</h3> | |
 | [Docs](https://www.univer.ai/examples/docs/)<br>Already open: ordered and unordered lists, paragraph settings, mixed graphics and text, multi-column/single column display in sections (tentative): hyperlinks, comments, tables, charts | [![](./docs/img/examples-docs.gif)](https://www.univer.ai/examples/docs/) |
 | [Docs Multi](https://www.univer.ai/examples/docs-multi/)<br>Multiple Univer instances can be created in a page so that doc can interoperate. | [![](./docs/img/examples-docs-multi.gif)](https://www.univer.ai/examples/docs-multi/) |

README-zh.md

@@ -63,7 +63,6 @@ Univer 的亮点包括：
 | [Sheets Collaboration Playground (Pro Feature)](https://univer.ai/pro-examples/sheets-collaboration-playground/)<br>演示协同的过程，A 编辑表格后，B 到底是如何处理的？这里是一个有趣的实验 | [![](./docs/img/pro-examples-sheets-collaboration-playground.gif)](https://univer.ai/pro-examples/sheets-collaboration-playground/) |
 | [Sheets Import/Export (Pro Feature)](https://univer.ai/pro-examples/sheets-exchange/)<br>支持 xlsx 文件导入和导出 | [![](./docs/img/pro-examples-sheets-exchange.gif)](https://univer.ai/pro-examples/sheets-exchange/) |
 | [Sheets Print (Pro Feature)](https://univer.ai/pro-examples/sheets-print/)<br>体验 Univer Sheets 的高清打印能力 | [![](./docs/img/pro-examples-sheets-print.gif)](https://univer.ai/pro-examples/sheets-print/) |
-| [Sheets Data Validation / Conditional Formatting](https://univer-qqqkeqnw5-univer.vercel.app/sheets/)<br>Univer Sheets 数据格式和条件格式的开发预览版 | [![](./docs/img/examples-sheets-data-validation-conditional-format.png)](https://univer-qqqkeqnw5-univer.vercel.app/sheets/) |
 | <h3>📝 Univer Docs</h3> | |
 | [Docs](https://www.univer.ai/examples/docs/)<br>已开放：有序无序列表、段落设置、图文混排、分节展示多列/单列（暂定）：超链接、批注、表格、图表 | [![](./docs/img/examples-docs.gif)](https://www.univer.ai/examples/docs/) |
 | [Docs Multi](https://www.univer.ai/examples/docs-multi/)<br>在一个页面中可以创建多个 Univer 实例，让doc可以实现互操作 | [![](./docs/img/examples-docs-multi.gif)](https://www.univer.ai/examples/docs-multi/) |

README.md

@@ -63,7 +63,6 @@ Highlights:
 | [Sheets Collaboration Playground (Pro Feature)](https://univer.ai/pro-examples/sheets-collaboration-playground/)<br>Demonstrate the process of collaboration. After A edits the form, how does B process it? Here is an interesting experiment | [![](./docs/img/pro-examples-sheets-collaboration-playground.gif)](https://univer.ai/pro-examples/sheets-collaboration-playground/) |
 | [Sheets Import/Export (Pro Feature)](https://univer.ai/pro-examples/sheets-exchange/)<br>Supports xlsx file import and export | [![](./docs/img/pro-examples-sheets-exchange.gif)](https://univer.ai/pro-examples/sheets-exchange/) |
 | [Sheets Print (Pro Feature)](https://univer.ai/pro-examples/sheets-print/)<br>Experience the HD printing capabilities of Univer Sheets | [![](./docs/img/pro-examples-sheets-print.gif)](https://univer.ai/pro-examples/sheets-print/) |
-| [Sheets Data Validation / Conditional Formatting](https://univer-qqqkeqnw5-univer.vercel.app/sheets/)<br>Development preview of Univer Sheets data formats and conditional formatting | [![](./docs/img/examples-sheets-data-validation-conditional-format.png)](https://univer-qqqkeqnw5-univer.vercel.app/sheets/) |
 | <h3>📝 Univer Docs</h3> | |
 | [Docs](https://www.univer.ai/examples/docs/)<br>Already open: ordered and unordered lists, paragraph settings, mixed graphics and text, multi-column/single column display in sections (tentative): hyperlinks, comments, tables, charts | [![](./docs/img/examples-docs.gif)](https://www.univer.ai/examples/docs/) |
 | [Docs Multi](https://www.univer.ai/examples/docs-multi/)<br>Multiple Univer instances can be created in a page so that doc can interoperate. | [![](./docs/img/examples-docs-multi.gif)](https://www.univer.ai/examples/docs-multi/) |