feat: remove marketplace doc (#151)

* feat: 移除插件市场入口

* feat: 移除插件开发文档中的插件市场相关内容

* feat: 删除插件市场相关文档

Author: bk1012

docs/extension/overview.en.md

@@ -87,14 +87,3 @@ In addition to the [VS Code Extension Samples](https://github.com/microsoft/vsco
 - Plain Webview Sample
 - Git Operation Sample
 - Command Sample?
-
-## Extension Marketplace
-
-Currently, OpenSumi supports two types of plugin marketplaces as shown below:
-
-![Extension Marketplace](https://img.alicdn.com/imgextra/i2/O1CN01Kq3jZf25zTjbBJWzR_!!6000000007597-2-tps-1906-732.png)
-
-- [AlipayCloud](https://ide.cloud.alipay.com/marketplace/square) —— A public extension marketplace service provided by Ant Group.
-- [OpenVSX](https://open-vsx.org/) —— A public extension marketplace service provided by the Eclipse Foundation (with open source code).
-
-You can freely switch between sources according to your usage scenario, see the documentation for [Custom Extension Marketplace](../integrate/universal-integrate-case/custom-marketplace-entrypoint).

docs/extension/overview.zh.md

@@ -85,14 +85,3 @@ Worker 端拥有 WebWorker 环境运行时，如果你的插件包含一些计
 - Plain Webview Sample
 - Git Operation Sample
 - Command Sample
-
-## 插件市场
-
-当前 OpenSumi 支持两种插件市场，如下面所示：
-
-![Extension Marketplace](https://img.alicdn.com/imgextra/i2/O1CN01Kq3jZf25zTjbBJWzR_!!6000000007597-2-tps-1906-732.png)
-
-- [AlipayCloud](https://ide.cloud.alipay.com/marketplace/square) —— 蚂蚁集团开放的支付宝小程序云插件市场
-- [OpenVSX](https://open-vsx.org/) —— Eclipse 基金会开放的公共插件市场服务（源码开源）
-
-可以根据使用场景自由进行源的切换，见文档 [自定义插件市场源](../integrate/universal-integrate-case/custom-marketplace-entrypoint)。

docs/integrate/universal-integrate-case/custom-marketplace-entrypoint.en.md

@@ -50,13 +50,6 @@ module.exports = {
           zh: '插件研发'
         }
       },
-      {
-        slug: 'https://ide.cloud.alipay.com/marketplace/square',
-        title: {
-          en: 'Marketplace',
-          zh: '插件市场'
-        }
-      },
       {
         slug: 'https://codeblitz.opensumi.com',
         title: {