change demos from kebab-case to PascalCase

[xiaoxiangmoe]

• I have searched the issues of this repository and believe that this is not a duplicate.

see https://vuejs.org/v2/style-guide/index.html#Component-name-casing-in-templates-strongly-recommended

In most projects, component names should always be PascalCase in single-file components
...
using kebab-case everywhere is also acceptable

It seems that it will be great if we change demo codes from from kebab-case to PascalCase

[tangjinzhou]

we will keep use kebab-case

<!-- Everywhere -->
<my-component></my-component>

[xiaoxiangmoe]

@tangjinzhou Which should I use in jsx? Button or AButton? ( by import { Button as AButton } from 'ant-design-vue' )

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