docs: use index.md for category

docs-en/04-develop/03-insert-data/_category_.yml

-label: Insert
-link:
-  type: generated-index
-  slug: /insert-data/
-  description: "TDengine supports multiple protocols of inserting data, including SQL, InfluxDB Line protocol, OpenTSDB Telnet protocol, OpenTSDB JSON protocol. Data can be inserted row by row, or in batch. Data from one or more collecting points can be inserted simultaneously. In the meantime, data can be inserted with multiple threads, out of order data and historical data can be inserted too. InfluxDB Line protocol, OpenTSDB Telnet protocol and OpenTSDB JSON protocol are the 3 kinds of schemaless insert protocols supported by TDengine. It's not necessary to create stable and table in advance if using schemaless protocols, and the schemas can be adjusted automatically according to the data to be inserted."
+label: Insert
\ No newline at end of file

docs-en/04-develop/03-insert-data/index.md

+---
+title: Insert
+---
+
+TDengine supports multiple protocols of inserting data, including SQL, InfluxDB Line protocol, OpenTSDB Telnet protocol, OpenTSDB JSON protocol. Data can be inserted row by row, or in batch. Data from one or more collecting points can be inserted simultaneously. In the meantime, data can be inserted with multiple threads, out of order data and historical data can be inserted too. InfluxDB Line protocol, OpenTSDB Telnet protocol and OpenTSDB JSON protocol are the 3 kinds of schemaless insert protocols supported by TDengine. It's not necessary to create stable and table in advance if using schemaless protocols, and the schemas can be adjusted automatically according to the data to be inserted.
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/04-develop/_category_.yml

-label: Develop
-link:
-  type: generated-index
-  slug: /develop
-  description: "The guide is for developers to quickly learn about the functionalities of TDengine, including fundamentals like data model, inserting data, query and advanced features like data subscription, continuous query. For each functionality, sample code of multiple programming languages are provided for developers to get started quickly."
+label: Develop
\ No newline at end of file

docs-en/04-develop/index.md

+---
+title: Develop
+---
+
+The guide is for developers to quickly learn about the functionalities of TDengine, including fundamentals like data model, inserting data, query and advanced features like data subscription, continuous query. For each functionality, sample code of multiple programming languages are provided for developers to get started quickly.
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/10-cluster/_category_.yml

 label: Cluster
-link:
-  type: generated-index
-  slug: /cluster/
-  description: "TDengine can be deployed in cluster mode to increase the processing capability and high availability. In cluster mode, any data can have multiple replications for the purpose of high availability and load balance. TDengine cluster can be scaled out easily to support more data collecting points and more data."
-  keywords:
-    [
-      cluster,
-      high availability,
-      load balance,
-      scale out
-    ]

docs-en/10-cluster/index.md

+---
+title: Cluster
+keywords: ["cluster", "high availability", "load balance", "scale out"]
+---
+
+TDengine can be deployed in cluster mode to increase the processing capability and high availability. In cluster mode, any data can have multiple replications for the purpose of high availability and load balance. TDengine cluster can be scaled out easily to support more data collecting points and more data.
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/13-operation/_category_.yml

 label: Administration
-link:
-  slug: /operation/
-  type: generated-index

docs-en/13-operation/index.md

+---
+title: Administration
+---
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/14-reference/_category_.yml

 label: Reference
-link:
-  slug: /reference/
-  type: generated-index
-  description: "参考指南是对 TDengine 本身、 TDengine 各语言连接器及自带的工具最详细的介绍。"

docs-en/14-reference/index.md

+---
+title: Reference
+---
+
+参考指南是对 TDengine 本身、 TDengine 各语言连接器及自带的工具最详细的介绍。
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/20-third-party/_category_.yml

 label: Third Party Tools
-link:
-  type: generated-index
-  slug: /third-party/
-  description: TDengine's support for standard SQL commands, common database connector standards (e.g., JDBC), ORM, and other popular time-series database writing protocols (e.g., InfluxDB Line Protocol, OpenTSDB JSON, OpenTSDB Telnet, etc.) makes TDengine very easy to use with third-party tools.
-  
+

docs-en/20-third-party/index.md

+---
+title: Third Party Tools
+---
+
+TDengine's support for standard SQL commands, common database connector standards (e.g., JDBC), ORM, and other popular time-series database writing protocols (e.g., InfluxDB Line Protocol, OpenTSDB JSON, OpenTSDB Telnet, etc.) makes TDengine very easy to use with third-party tools.
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/21-tdinternal/_category_.yml

-label: TDengine Inside
-link:
-  slug: /tdinternal/
-  type: generated-index
\ No newline at end of file
+label: TDengine Inside
\ No newline at end of file

docs-en/21-tdinternal/index.md

+---
+title: TDengine Inside
+---
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/25-application/_category_.yml

 label: Application Practice
-link:
-  slug: /application/
-  type: generated-index

docs-en/25-application/index.md

+---
+title: Application Practice
+---
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file

docs-en/27-train-faq/_category_.yml

 label: FAQ & Others
-link:
-  slug: /train-faq/
-  type: generated-index

docs-en/27-train-faq/index.md

+---
+title: FAQ & Others
+---
+
+```mdx-code-block
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+<DocCardList items={useCurrentSidebarCategory().items}/>
+```
\ No newline at end of file