page.mdx File
page file
is a special
Next.js App Router convention file 
which allows you to define UI that is unique to a route:
- layout.jsx
- page.jsx
- page.mdx
- page.mdx
💡
Tip
By default, the .js, .jsx, or .tsx file extensions can be used for
page.
Nextra enhance them with .md and .mdx extensions.
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