Update examples/with-antd-mobile

[HaNdTriX]

I have rewritten the with-antd-mobile example to make it simpler and easier to understand.

• migrated to with-antd-mobile@2
• dropped deprecated polyfills
• used next-css
• removed complex pages (this is now userland)
• removed i18n (this is now userland)
• added global font styles

@Enalmada can you give me a review on this?

Closes #5419

[Enalmada]

It is good you have simplified the example. An example should only have the minimum necessary to empower the user to add anything else they want. I do feel it would be convenient to leave the MenuBar.js. It shows off a few things like routing onPress={() => Router.push(link)} that let new users hit the ground running. I would think it would be fine if the links each are going to a few sample pages equivalent to what you have now with index but different wording showing the routing is working.

I am concerned about the lack of any kind of icon example. Will new users have any problems using the default provided icons without the require-hacker and svg-sprite-loader example code in next.config.js? No one is ever gonna figure out how to get that stuff in the original next.config.js back if it is necessary to get icons working. I am really hoping none of that is actually necessary but worried that it is and users will hit a brick wall when trying to get icons working.

[HaNdTriX]

@Enalmada Thanks for your feedback 🙏. I improved the example so some basic usecases are covered.

Afaik you don't need any special config like require hacker or some svg loader. Icons should just work 😃.