Add Non-HTML Pages example

[leoj3n]

Adds an example for this use case:

https://docs.astro.build/en/core-concepts/astro-pages/#non-html-pages

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Latest commit: 7bae87b

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[FredKSchott]

thank you!

[FredKSchott]

BTW I cleaned up the example a bit to work in build as well as dev. When you build your site, there is no dev server running, so calling fetch() during build does nothing work. These generated files are best used on the frontend, while import and fetchContent are best used in your frontmatter.

5370bba