[v2] Fix unused Container component references in part-two of tutorial

[koreyboone]

No description provided.

[koreyboone]

The Container component within the CSS-In-JS section is created and imported but not use. It has inline styles that are also included in the about-css-modules.module.css
I remove the .container css from the module and replaced the root div in about-css-modules with Container.

[KyleAMathews]

Thanks! This section is a bit confusing as we removed the css-in-js examples awhile ago and forgot to change the Container to use css modules. I'll merge this and then make that change.

[koreyboone]

@KyleAMathews Yeah I also added a container.module.css to the components directory and included the margin: "3rem auto", maxWidth: 600 but wasn't sure if the inline style was on purpose or not so I didn't commit it. I'd be happy to submit another pull request for that... ?

[KyleAMathews]

Ah great! Just put up my PR with the copy changes that were needed as well — would love your review! #6001

[jlengstorf]

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