Add app folder for component dev and demos

[jschuler]

Add demo app so we can easily develop and test new components.

https://marvelous-kringle-597c4a.netlify.app/

[velias]

Looks cool.
I expect the app is not part of the published NPM, is not bundled in it.
There might be mention of the app folder and its content in main README.md, but mainly link to the deployed app, or maybe even links from individual components description to the relevant page of the app, so one can see what is the NPM providing, how is it rendering the data?
Is that Gitgub Action for deployment finished, seems link provided above is another deployment?
Is it possible to somehow integrate this app deployment into our documentation site, ideally under https://redhat-ux.github.io/next-gen-ui-agent/example/ ? Or deployment can be somewhere else, and only link provided from the documentation site.

[jschuler]

@velias yes the new app folder will not be bundled in npm package. we have whitelist in package.json on what gets included:

"files": [
    "dist",
    "README.md",
    "LICENSE"
  ],

Once this PR is merged to main branch we can update the GH pages repo settings to build it out.

One-Time GitHub Pages Setup

Go to GitHub Repository Settings:
Navigate to: https://github.com/RedHat-UX/next-gen-ui-react/settings/pages

Configure GitHub Pages:
Under Source, select: GitHub Actions (not "Deploy from a branch")

We can also update main README to point to it later on, also good idea to see if we can link it or update the next-gen-ui-agent docs. Maybe next steps?

[velias]

@jschuler cool, feel free to merge this PR and continue with next steps, thanks