feat(vite-plugin-nitro): prerender content dir routes

[d-koppenhagen]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/analogjs/analog/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Which package are you modifying?

• vite-plugin-angular
• vite-plugin-nitro
• astro-angular
• create-analog
• router
• platform
• content
• nx-plugin
• trpc

What is the current behavior?

Closes #820

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[optional] What gif best describes this PR or how it makes you feel?

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[brandonroberts]

@d-koppenhagen I think this is on the right track. Will you check on the build failures?

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[d-koppenhagen]

@brandonroberts I refactored it a bit and added also some more documentation and fixed the tests. It should now work as expected.

[brandonroberts]

@d-koppenhagen there are lots of files changed that aren't necessary for this PR. Any idea what happened there?

[d-koppenhagen]

I had run prettier as a GitHub action was red since formatting was not ok.
It's a separate commit.
I can revert it and cleanup my commits a bit.

[d-koppenhagen]

I think a big part of the changed files are the ones of the blog demo app which I updated to demo the new feature here.

[d-koppenhagen]

@brandonroberts sorry it took a while but now the build and format etc. is green.

[brandonroberts]

Thanks @d-koppenhagen!