[Doc] remove outdated contribution guide (#3195)

.github/CONTRIBUTING.md

@@ -5,11 +5,13 @@ The following is a set of guidelines for contributing to Vant. Please spend seve
 Anyway, these are just guidelines, not rules, use your best judgment and feel free to propose changes to this document in a pull request.
 
 ## Opening an Issue
+
 If you think you have found a bug, or have a new feature idea, please start by making sure it hasn't already been reported or fixed. You can search through existing issues and PRs to see if someone has reported one similar to yours.
 
 Next, create a new issue that briefly explains the problem, and provides a bit of background as to the circumstances that triggered it, and steps to reproduce it.
 
 ## Submitting a Pull Request
+
 It's welcomed to pull request, And there are some tips about that:
 
 - Before working on a large change, it is best to open an issue first to discuss it with the maintainers.
@@ -35,8 +37,3 @@ npm run dev
 
 # open http://localhost:8080
 ```
-
-## Component Developing Guidelines
-- Create new directory under `packages` for a new component.
-- Refer to `Sku` for nested components.
-- Refer to `Button` for components that depend on other components.

docs/markdown/contribution.zh-CN.md

@@ -103,11 +103,11 @@ export default {
 
 #### 5. API 说明
 
-组件的 API 说明，请以表格的形式书写，表格包含以下列：
+组件的 API 说明以表格的形式书写，表格包含以下列：
 
 | 参数 | 说明 | 类型 | 默认值 |
 | ------------ | ------------- | -------- | ---------- |
-| visible | 是否可见 | bool | `false` |
+| visible | 是否可见 | `Boolean` | `false` |
 
 #### 6. Event 说明
 
@@ -116,29 +116,3 @@ export default {
 | 事件名 | 说明 | 参数 |
 |-----------|-----------|-----------|
 | click | 点击按钮时触发 | event：事件对象 |
-
-### 实用技巧
-
-#### 组件互相引用
-
-比如说 `Dialog` 里面引用了 `Button` 组件，直接写相对路径引用即可。
-
-```js
-import Button from '../button';
-```
-
-#### 组件创建
-
-Vant 中的组件会通过 `create` 方法统一创建，`create` 方法会在选项文件中注入基本的依赖和方法。
-
-```js
-import create from '../utils/create';
-
-export default create({
-  name: 'button'
-});
-```
-
-#### 样式
-
-组件样式使用 `precss 3.0` 作为预处理器，具体语法请参考 [precss 文档](https://github.com/jonathantneal/precss).