feature: content reuse

[sbvegan]

Description

Example of how we can import .md files into our .mdx files to enable content reuse.

You can compare the preview to the live page and see there's no difference https://docs.optimism.io/builders/chain-operators/architecture

Tests

Please describe any tests you've added. If you've added no tests, or left important behavior untested, please explain why not.

Additional context

Add any other context about the problem you're solving.

Metadata

• Fixes #[Link to Issue]