examples: update with-orbit-components README

[Marukome0743]

What?

Remove below 2 lines from with-orbit-components README.md.

For this purpose we are extending `<App />` of injected `<ThemeProvider/>`, and also adding `@kiwicom/babel-plugin-orbit-components`.

This fork comes from [styled-components-example](https://github.com/vercel/next.js/tree/canary/examples/with-styled-components).

Why?

At #73266, Both <ThemeProvider/> and @kiwicom/babel-plugin-orbit-components were deleted.
In addition, styled-components isn't used anymore.

Adding or Updating Examples

• The "examples guidelines" are followed from our contributing doc https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md
• Make sure the linting passes by running pnpm build && pnpm lint. See https://github.com/vercel/next.js/blob/canary/contributing/repository/linting.md

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: e549934

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[samcx]

@Marukome0743 Nice catch!