feat: flexbox example the odin project

[Sembauke]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Closes #XXXXX

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
@codesandbox/sandpack-react	2.10.0	eval, network, filesystem	+47	80 MB	danilowoz

[socket-security]

🚨 Potential security issues detected. Learn more about Socket for GitHub ↗︎

To accept the risk, merge this PR and you will not be notified again.

Issue	Package	Version	Note	Source
Protestware/Troll package	es5-ext	0.10.62	Note: This package prints a protestware console message on install regarding Ukraine for users with Russian language locale	@codesandbox/sandpack-react@2.10.0 via apps/top-flex-box-example/package.json

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• @SocketSecurity ignore es5-ext@0.10.62

[Sembauke]

I am not sure why the linter is so whiney.

[naomi-lgbt]

I'll take a peek.

[naomi-lgbt]

Hey @Sembauke,

Some notes here:

• First, this needs to be wrapped in an express server so that PM2 can serve it correctly (and the tests expect that as well).
• Second, I don't believe our pipeline allows for a build step - we'd need to fetch React from a CDN and serve the index.html file through Express.

You can refer to the apps/markdown-previewer project to see how this is done.