docs: add 'Open in StackBlitz' buttons to various examples (#25853 )

This PR adds a `Preview` section and a `Open in StackBlitz` button to various examples. I have tested all examples and omitted the ones that require third party API keys, or didn't work. Some examples don't work locally either.

Here's an example:
![image](https://user-images.githubusercontent.com/12571019/121027783-88971280-c7a7-11eb-851a-0ad30cf74b42.png)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [x] Examples updated
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [x] Make sure the linting passes

2021-06-08 20:45:02 +00:00

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TypeScript Next.js example

This is a really simple project that shows the usage of Next.js with TypeScript.

Preview

Preview the example live on StackBlitz:

Deploy your own

Deploy the example using Vercel:

How to use it?

Execute create-next-app with npm or Yarn to bootstrap the example:

npx create-next-app --example with-typescript with-typescript-app
# or
yarn create next-app --example with-typescript with-typescript-app

Deploy it to the cloud with Vercel (Documentation).

Notes

This example shows how to integrate the TypeScript type system into Next.js. Since TypeScript is supported out of the box with Next.js, all we have to do is to install TypeScript.

npm install --save-dev typescript

To enable TypeScript's features, we install the type declarations for React and Node.

npm install --save-dev @types/react @types/react-dom @types/node

When we run next dev the next time, Next.js will start looking for any .ts or .tsx files in our project and builds it. It even automatically creates a tsconfig.json file for our project with the recommended settings.

Next.js has built-in TypeScript declarations, so we'll get autocompletion for Next.js' modules straight away.

A type-check script is also added to package.json, which runs TypeScript's tsc CLI in noEmit mode to run type-checking separately. You can then include this, for example, in your test scripts.

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